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12,244 real negative results, null findings, and replication failures in Medicine. Search the index →

WASTE indexes published research — it does not host or republish full papers. Each entry is a metadata record compiled from open scholarly databases; the abstract is shown in full only where the paper is openly licensed, otherwise a short excerpt under fair use. Classifications are automated and approximate.

Negative / Null Result ReportOpen accessMedicine

Investigating the Relationship between Self-Directed Learning and E-Citizenship knowledge and its comparison between Students of University of Mazandaran and Babol University of Medical Sciences

fatemeh marhemati, reza mir arab razi, mostafa azizi · 2020 · آموزش پزشکی

Background and Objective: Creating and developing self-directed learning skills has become one of the goals of education in recent decades, and today's students need to learn and acquire comprehensive information in this regard, or better to say, learn information and communication technology skills, to Be able to use electronic services. The purpose of this study was to investigate the relationship between electronic citizenship knowledge and self-directed learning of students of University of Mazandaran and Babol University of medical sciences. Methods: This study is descriptive-analytical i

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Negative / Null Result ReportOpen accessMedicine

Effects of Intraosseous Tibial vs. Intravenous Vasopressin in a Hypovolemic Cardiac Arrest Model

Justin Fulkerson, MSN, Robert Lowe, BSN, Tristan Anderson, BSN et al. · 2016 · Western Journal of Emergency Medicine

Introduction: This study compared the effects of vasopressin via tibial intraosseous (IO) and intravenous (IV) routes on maximum plasma concentration (Cmax), the time to maximum concentration (Tmax), return of spontaneous circulation (ROSC), and time to ROSC in a hypovolemic cardiac arrest model. Methods: This study was a randomized prospective, between-subjects experimental design. A computer program randomly assigned 28 Yorkshire swine to one of four groups: IV (n=7), IO tibia (n=7), cardiopulmonary resuscitation (CPR) + defibrillation (n=7), and a control group that received just CPR (n=7).

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Negative / Null Result ReportOpen accessMedicine

Serum Vascular Endothelial Growth Factor in Pregnant Women with Different Types of Assisted Reproductive Techniques

Zainab Y. Ejam, Şevki Adem, Asmaa Kadhim Gatea · 2024 · Medical Journal of Babylon

Background: Vascular endothelial growth factor (VEGF) is crucial for the implantation of a fertilized egg and for the development of placental blood vessels. This study was conducted to detect the serum VEGF level of pregnant with different types of assisted reproductive techniques in relation to the age group, body mass index (BMI), and type of infertility. Objectives: The aim of this study was to determine the levels of serum VEGF in different types of assisted pregnancy. Materials and Methods: Enzyme-linked immunosorbent assay was used for the detection of VEGF levels in the serum of pregna

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Negative / Null Result ReportOpen accessMedicine

Aqueous and methanol extracts of Paullinia pinnata improve MSUc uptake in macrophages and in vitro antioxidant effects

Pius Pum Tseuguem, Télesphore Benoît Nguelefack, Elvine Pami Nguelefack-Mbuyo et al. · 2026 · Scientific Reports

Abstract Extracts of Paullinia pinnata have demonstrated therapeutic effects in monosodium urate (MSU)-induced gout in rats, notably by reducing inflammation and hyperalgesia, as well as enhancing antioxidant activity in vivo. However, their in vitro antioxidant potential and their effects on MSU-stimulated macrophages remain insufficiently explored. This study aims to investigate the in vitro antioxidant properties of P. pinnata, with a particular focus on MSU uptake in stimulated macrophages. The in vitro antioxidant activities of aqueous (AEPP) and methanolic (MEPP) extracts of P. pinnata l

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Negative / Null Result ReportOpen accessMedicine

Temporal and spatial distribution of soil water and nitrate content affected by surface irrigation and fertilizer rate in silage corn fields

Yuchun Liu, Ning Wang, Changsong Jiang et al. · 2020 · Scientific Reports

Abstract Among surface irrigation systems, long border and furrow are more adaptive to mechanized farming but may cause a non-uniform distribution of water and nutrients. In this study, field experiments were carried out in a flat silage corn field in Hebei, China to investigate the uniformity along the length of border or furrow to understand the spatial and temporal distribution characteristics of soil water, electrical conductivity, and nitrate. This will guide irrigation and fertigation management recommendations, land consolidation, and high standard farmland construction. Border and furr

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Negative / Null Result ReportOpen accessMedicine

Body Mass Index and Risk of Prostate Volume, International Prostate Symptom Score, Maximum Urinary Flow Rate, and Post-Void Residual in Benign Prostatic Hyperplasia Patients

Bing-Hui Li, Tong Deng, Qiao Huang et al. · 2019 · American Journal of Men's Health

The objective of this study was to evaluate association between body mass index (BMI) and prostate volume (PV), international prostate symptom scores (IPSS), maximum urinary flow rate ( Q max ), and post-void residual (PVR) of Chinese benign prostatic hyperplasia (BPH) patients. All newly diagnosed BPH patients between September 2016 and August 2018 were selected and 788 patients were included. According to BMI, the patients were categorized into four groups, while according to PV, IPSS, Q max , and PVR, they were categorized into two groups based on clinical significant cutoffs. Univariable a

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Negative / Null Result ReportOpen accessMedicine

Neuromuscular dynamics during isometric knee contractions: effects of target force, knee angle, and tibial rotation on force steadiness

Han Yuan, Maeng-Kyu KIM · 2025 · Scientific Reports

Abstract This study investigated neuromuscular variations across low to moderate target force levels, three knee joint angles and tibial rotation positions, examining their correlations with muscle morphology and their collective impact on force steadiness (FS). Twelve young adult males performed knee extension tasks under three different tibial rotation conditions: internal rotation (IR), neutral rotation (NR), and external rotation (ER). All tasks involved submaximal isometric contractions at the knee joint. Participants performed submaximal isometric contractions at three knee joint angles

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Negative / Null Result ReportOpen accessMedicine

Application and limitation of a biological clock-based method for estimating time of death in forensic practices

Akihiko Kimura, Yuko Ishida, Mizuho Nosaka et al. · 2023 · Scientific Reports

Abstract Estimating time of death is one of the most important problems in forensics. Here, we evaluated the applicability, limitations and reliability of the developed biological clock-based method. We analyzed the expression of the clock genes, BMAL1 and NR1D1, in 318 dead hearts with defined time of death by real-time RT-PCR. For estimating the time of death, we chose two parameters, the NR1D1/BMAL1 ratio and BMAL1/NR1D1 ratio for morning and evening deaths, respectively. The NR1D1/BMAL1 ratio was significantly higher in morning deaths and the BMAL1/NR1D1 ratio was significantly higher in e

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Negative / Null Result ReportOpen accessMedicine

Is genu varum a risk factor for the prevalence and severity of achilles tendinopathy? A cross-sectional study of Nigerian elite track and field athletes

Ayoola Ibifubara Aiyegbusi, Bosede Abidemi Tella, Ganiyat Adebanke Sanusi · 2020 · Nigerian Postgraduate Medical Journal

Background: Achilles tendinopathy (AT) is one of the most frequently reported ankle and foot overuse injuries. Prior studies have reported altered biomechanical variables of the lower limb as risk factors for the prevalence and severity of AT in athletes, especially in Caucasians, but there are few reports on African elite athletes. Because it is established that anthropometric and biomechanical values vary with racial disposition, this study was designed to investigate the association between selected physical and biomechanical variables of the lower limb and the prevalence and severity of AT

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Negative / Null Result ReportOpen accessMedicine

The dietary patterns of 12-year-old children and their awareness about the effect of diet on oral health in Iran

Maryam Rad, Arash Shahravan, Ali Akbar Haghdoost · 2017 · Journal of Oral Health and Oral Epidemiology

BACKGROUND AND AIM: Foods containing carbohydrates have a major effect on the pathogenesis of dental caries. There is a direct correlation between frequency of consumption of foods containing sugar and dental caries. The purpose of this study was to evaluate the dietary patterns of 12-year-old children and their awareness about the effect of diet on oral health in Iran. METHODS: A cross-sectional survey was conducted on 1554 children aged 12 years in 5 provinces in Iran. Subjects were selected based on a multistage stratified cluster random sampling procedure. Data were collected by a cultural

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Negative / Null Result ReportOpen accessMedicine

Estimation of Serum Ferritin Levels in Blood Donors and its Association with Frequency of Blood Donation and Blood Indices

Amrita S Kumar, A Geetha, Jim Joe et al. · 2021 · Journal of Clinical and Diagnostic Research

Introduction: Blood donation is one of the most significant contributions that a person can make towards the society. A donor generally donates maximum 450 mL of blood at the time of donation. If 450 mL of blood is taken in a donation, men lose 242±17 mg and women lose 217±11 mg of iron. Hence, adequate iron stores are very important in maintenance of the donor’s health. Aim: To assess the influence of frequency of blood donation on iron levels of blood donors by estimating Haemoglobin (Hb) and other blood indices which reflect iron status of blood and serum ferritin which reflects body iron s

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Negative / Null Result ReportOpen accessMedicine

Unmet Nutritional and Psychological Needs of Cancer Patients: An Integrated Multi-Professional Model Approach

Giuseppe Carruba, Maria Luisa Calagna, Ildegarda Campisi et al. · 2022 · Diseases

This paper presents a multi-professional integrated approach toward the recognition and management of the nutritional and psychological needs of cancer patients. In particular, the patients undertook a multi-professional, multistep process that included the collection of both personal and clinical data, the evaluation of anthropometric measures, nutritional status and psychometric indices, and an ensuing personalized nutritional prescription and psychological support, ultimately leading to combined nutritional and psychological interventions to control their adherence to a nutritional program

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Negative / Null Result ReportOpen accessMedicine

Changes in brain white matter structure are associated with urine proteins in urologic chronic pelvic pain syndrome (UCPPS): A MAPP Network study.

Davis C Woodworth, Adelle Dagher, Adam Curatolo et al. · 2018 · PLoS ONE

The Multidisciplinary Approach to the Study of Chronic Pelvic Pain (MAPP) Research Network has yielded neuroimaging and urinary biomarker findings that highlight unique alterations in brain structure and in urinary proteins related to tissue remodeling and vascular structure in patients with Urological Chronic Pelvic Pain Syndrome (UCPPS). We hypothesized that localized changes in diffusion tensor imaging (DTI) measurements might be associated with corresponding changes in urinary protein levels in UCPPS. To test this hypothesis, we created statistical parameter maps depicting the linear corre

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Negative / Null Result ReportOpen accessMedicine

Association between obesity and mortality from hematological malignancies among Japanese adults: The Japan Collaborative Cohort study.

Hana Wakasa, Satoshi Sunohara, Takashi Kimura et al. · 2025 · PLoS ONE

Obesity is a growing global health concern and has been associated with increased mortality from various cancer types, including hematological malignancies. However, evidence for this association in Asian populations, particularly among Japanese adults, remains limited. Thus, this study aimed to examine the association between obesity and mortality due to hematological malignancies. Data from 97,073 participants in the Japan Collaborative Cohort (JACC) Study were analyzed. The participants were followed for a mean duration of 17 years. Body mass index (BMI) was calculated using self-reported h

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Negative / Null Result ReportOpen accessMedicine

DIASTASIS RECTI ABDOMINIS AND ITS ASSOCIATED RISK FACTORS IN POSTPARTUM WOMEN

Muhammad Hussain Iqbal, Tanveer Hussain, Fariha Khalid et al. · 2020 · Pakistan Armed Forces Medical Journal

Objective: To determine the frequency of diastasis recti abdominis and its associated risk factors in postpartum women. Study Design: Cross-sectional study. Place and Duration of Study: Omar Medical Center Lahore, Yaseen Medical Center Lahore and Social Security Hospital Lahore, from Sep 2019 to Dec 2019. Methodology: This study included 128 participants fulfilling the eligibility criteria. The assessment of diastasis recti abdominis was done manually by a female physiotherapist using single finger, double finger and three finger methods on abdomen at three levels: at the umbilicus, 4.5 cm bel

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Negative / Null Result ReportOpen accessMedicine

Assessment of Retinal and Choroidal Measurements in Chinese School-Age Children with Cirrus-HD Optical Coherence Tomography.

Tao Li, Xiaodong Zhou, Zhi Wang et al. · 2016 · PLoS ONE

To evaluate retinal thickness (RT), retinal volume (RV) and choroidal thickness (ChT) in Chinese children using Cirrus-HD optical coherence tomography (OCT), and assess their associations with spherical equivalent (SE), age and gender.This was a prospective study that recruited 193 healthy Chinese children (193 eyes) with no ophthalmic disease history between December 2012 and December 2013. RT and RV were acquired using OCT. Subfoveal ChT (SFCT) and ChT1-mm and 2-mm temporal, nasal, superior and inferior to the fovea were measured manually.RT in the inner temporal and nasal regionsdiffered si

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Negative / Null Result ReportOpen accessMedicine

Variations of five eIF4E genes across cassava accessions exhibiting tolerant and susceptible responses to cassava brown streak disease.

Shanshan Shi, Xiuchun Zhang, M Alejandra Mandel et al. · 2017 · PLoS ONE

Cassava (Manihot esculenta) is an important tropical subsistence crop that is severely affected by cassava brown streak disease (CBSD) in East Africa. The disease is caused by Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV). Both have a (+)-sense single-stranded RNA genome with a 5' covalently-linked viral protein, which functionally resembles the cap structure of mRNA, binds to eukaryotic translation initiation factor 4E (eIF4E) or its analogues, and then enable the translation of viral genomic RNA in host cells. To characterize cassava eIF4Es and their potent

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Negative / Null Result ReportOpen accessMedicine

Disparities in the quality of care for chronic hepatitis C among Medicare beneficiaries.

Linh Tran, Jeah Jung, Roger Feldman et al. · 2022 · PLoS ONE

Purpose Chronic hepatitis C virus (HCV) infection is an important public health concern. Limited information exists on disparities in the quality of HCV care. We examine disparities in genotype or quantitative HCV ribonucleic acid testing before and after starting HCV treatment, and screening for hepatocellular carcinoma (HCC) in HCV patients with cirrhosis. Methods This national study included Medicare beneficiaries with HCV between 2014 and 2017. We used bivariate probit to estimate the probability of receiving recommended tests before and after HCV treatment by patient race/ethnicity, urban

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Negative / Null Result ReportOpen accessMedicine

The effect of foetal growth restriction on the development of migraine and tension-type headache in adulthood. The HUNT Study.

Sigrid Børte, Bendik S Winsvold, Synne Øien Stensland et al. · 2017 · PLoS ONE

Background There is little knowledge about how factors early in life affect the development of migraine and tension-type headache. We aimed to examine whether growth restriction in utero is associated with development of migraine and frequent tension-type headache in adults. Methods The population-based Nord-Trøndelag Health Study (HUNT 3) contained a validated headache questionnaire, which differentiated between migraine and tension-type headache. These data were linked to information on weight and gestational age at birth from the Norwegian Medical Birth Registry. In total 4557 females and 2

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Negative / Null Result ReportOpen accessMedicine

Post hoc analysis of a randomised controlled trial: effect of vitamin D supplementation on circulating levels of desmosine in COPD

Rob Janssen, Jef Serré, Ianthe Piscaer et al. · 2020 · ERJ Open Research

Background Vitamin D supplementation lowers exacerbation frequency in severe vitamin D-deficient patients with COPD. Data regarding the effect of vitamin D on elastin degradation are lacking. Based on the vitamin's anti-inflammatory properties, we hypothesised that vitamin D supplementation reduces elastin degradation, particularly in vitamin D-deficient COPD patients. We assessed the effect of vitamin D status and supplementation on elastin degradation by measuring plasma desmosine, a biomarker of elastin degradation. Methods Desmosine was measured every 4 months in plasma of 142 vitamin D-na

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Negative / Null Result ReportOpen accessMedicine

Mortality and other adverse outcomes in patients with type 2 diabetes mellitus admitted for COVID-19 in association with glucose-lowering drugs: a nationwide cohort study

Luis M. Pérez-Belmonte, José David Torres-Peña, María D. López-Carmona et al. · 2020 · BMC Medicine

Abstract Background Limited evidence exists on the role of glucose-lowering drugs in patients with COVID-19. Our main objective was to examine the association between in-hospital death and each routine at-home glucose-lowering drug both individually and in combination with metformin in patients with type 2 diabetes mellitus admitted for COVID-19. We also evaluated their association with the composite outcome of the need for ICU admission, invasive and non-invasive mechanical ventilation, or in-hospital death as well as on the development of in-hospital complications and a long-time hospital st

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Negative / Null Result ReportOpen accessMedicine

Sarcopenia and fall-related outcomes in Chinese adults aged 45 years or older: a longitudinal cohort study

Xin Zhao, Chaoxuan Wang, Jian Wang et al. · 2026 · Scientific Reports

Abstract Sarcopenia, the progressive loss of muscle mass and function, is a significant health concern in middle-aged and older adults, potentially linked to adverse outcomes like falls and fractures. A cohort study was conducted utilizing participants aged ≥ 45 years from CHARLS. Sarcopenia was defined using established criteria. Primary outcomes were isolated falls, isolated hip fractures, and composite outcomes. Associations were assessed using multivariable Cox regression (adjusted for confounders), propensity score matching (PSM), and inverse probability weighting (IPW), reporting hazard

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Negative / Null Result ReportOpen accessMedicine

Free 25(OH)D3 levels in follicular ovarian fluid top-quality embryos are higher than non-top-quality embryos in the normoresponders group

Artha Falentin Putri Susilo, Hanom Husni Syam, Hartanto Bayuaji et al. · 2024 · Scientific Reports

Abstract Vitamin D and calcium in follicular fluid play an important role in modulating steroidogenesis, folliculogenesis, and oocyte quality determination. Both collaborate to produce top-quality embryos (TQE) during in vitro fertilization (IVF). In this study, we compared free 25(OH)D3 and calcium levels in follicular fluid between TQE and non-TQE groups. This cross-sectional study included women who underwent IVF procedures at tertiary hospitals in Bandung, Indonesia. Ovarian follicular fluid was collected during the ovum pick-up procedure. The examination of 25(OH)D3 levels, vitamin d-bind

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Negative / Null Result ReportOpen accessMedicine

ASSOCIATION BETWEEN HIV INFECTION AND ONCOGENIC HPV SUBTYPES IN CISGENDER WOMEN

Sarah Moreira de Sousa Gomes, Paulo César Apolinário de Souza, Cassiane Freitas Rodrigues et al. · 2026 · DST

Introduction: Women living with HIV/AIDS (WLHA) are more vulnerable to human papillomavirus (HPV) infection, particularly by high-risk oncogenic subtypes, due to HIV-associated immunosuppression. Objective: To assess the prevalence and distribution profile of HPV subtypes in WLHA, correlating findings with CD4 levels and age group. Methods: A cross-sectional study was conducted with 184 WLHA receiving care at a public referral center in Juiz de Fora, Minas Gerais, from May 2021 to May 2022. Self-collected vaginal samples were analyzed by RT-PCR to detect HPV subtypes. Associations between HPV

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Negative / Null Result ReportOpen accessMedicine

Mammographic breast density and its association with urinary estrogens and the fecal microbiota in postmenopausal women.

Gieira S Jones, Heather Spencer Feigelson, Roni T Falk et al. · 2019 · PLoS ONE

Background Breast density, as estimated by mammography, is a strong risk factor for breast cancer in pre- and postmenopausal women, but the determinants of breast density have not yet been established. The aim of this study was to assess if urinary estrogens or gut microbiota alterations are associated with mammographic density in postmenopausal women. Methods Among 54 cancer-free, postmenopausal controls in the Breast and Colon Health study, we classified low- versus high-density women with Breast Imaging Reporting and Data System (BI-RADS, 5th edition) mammographic screening data, then asses

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Negative / Null Result ReportOpen accessMedicine

Microperimetry – A New Tool for Assessing Retinal Sensitivity in Macular Diseases

Memota Laishram, Krishnagopal Srikanth, AR Rajalakshmi et al. · 2017 · Journal of Clinical and Diagnostic Research

Introduction: Macular disease is the leading cause of low vision in the Western world. Drusen and pigmentary irregularities are common among the rural Northern Indian population. The disease process leads to loss of central vision, metamorphopsia, macropsia or micropsia and colour vision defect. Aim: To study the retinal sensitivity changes in macular diseases using microperimetry. Materials and Methods: It was an observational study, conducted in the Department of Ophthalmology at a rural tertiary care hospital. This study was started from December 2014 until June 2016, in all patients with m

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Negative / Null Result ReportOpen accessMedicine

Correlation between Duration of Antiretroviral Therapy and Glomerular Filtration Rate in People Living with HIV/AIDS: A Cross-sectional Study in Cirebon, West Java, Indonesia

Tiara Sekar Ayudhipasha, Menik Herdwiyanti, Sedayu Sedayu · 2025 · GHMJ (Global Health Management Journal)

Background: West Java ranks the highest Province with Human Immunodeficiency Virus (HIV) case in 2023. An estimated 1.648 patients estimated receive antiretroviral therapy (ART). Kidney disease contributes mortality amongst people living with HIV/AIDS (PLWH). Tenofovir disoproxil fumarate (TDF)-based ART was associated as risk factor of kidney disorders, indicate by declining glomerular filtration rate (GFR). However, there is limited study whether kidney disease among PLWH were related to ART use in Indonesia. Aims: To determine correlation between duration of antiretroviral therapy and glome

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Negative / Null Result ReportOpen accessMedicine

Evaluation of the relationship between muscle mass and serum myostatin levels in chronic hemodialysis patients

Derya Koyun, Gokhan Nergizoglu, Kemal Metin Kir · 2018 · Saudi Journal of Kidney Diseases and Transplantation

The loss of muscle mass and cachexia is commonly seen in hemodialysis (HD) patients and contribute to morbidity and mortality. The exact mechanism of this fact is multifactorial and still unclear. Myostatin, a transforming growth factor-ß family ligand, is released from the skeletal and heart muscle and may be responsible for muscle degradation and atrophy. The aim of this study is evaluation of the relationship between muscle mass and serum myostatin level in chronic HD patients. One hundred and forty HD patients (79 males, 28 diabetic, mean age; 53.96 ± 13.6) were included in this cross-sect

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