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Annette Mouritsen Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Alexander Siegfried Busch Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Lise Aksglaede Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Ewa Rajpert-De Meyts Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Anders Juul Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Introduction Testosterone (T) promotes maturation of the male reproductive organs, development of secondary sex characteristics and production of sperm by the testes. In puberty in boys, pulsatile gonadotropin stimulation upon reactivation of

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André Marques-Pinto Serviço de Endocrinologia, Departamento de Endocrinologia, Faculdade de Medicina da Universidade do Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal

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Davide Carvalho Serviço de Endocrinologia, Departamento de Endocrinologia, Faculdade de Medicina da Universidade do Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal
Serviço de Endocrinologia, Departamento de Endocrinologia, Faculdade de Medicina da Universidade do Porto, Al. Prof. Hernâni Monteiro, 4200-319 Porto, Portugal

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primarily masculine in 20%, while 27% have both male and female abnormalities, and no evident cause is identified as for the remaining 15% (2) . Since the mid-20th century, numerous studies have reported an increasing incidence of human reproductive

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Trine Holm Johannsen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Jakob Albrethsen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Vassos Neocleous The Cyprus Institute of Neurology and Genetics, Department of Molecular Genetics, Function and Therapy, Nicosia, Cyprus

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Federico Baronio S. Orsola-Malpighi University Hospital, Department of Medical and Surgical Sciences, Bologna, Italy

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Martine Cools Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University Hospital and Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium

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Lise Aksglaede Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Niels Jørgensen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Peter Christiansen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Meropi Toumba The Cyprus Institute of Neurology and Genetics, Department of Molecular Genetics, Function and Therapy, Nicosia, Cyprus
Pediatric Endocrinology Clinic, Department of Pediatrics, Aretaeio Hospital, Nicosia, Cyprus

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Pavlos Fanis The Cyprus Institute of Neurology and Genetics, Department of Molecular Genetics, Function and Therapy, Nicosia, Cyprus

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Marie Lindhardt Ljubicic Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Anders Juul Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
Department of Clinical Medicine, University of Copenhagen, Denmark

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; however, adult patients with CAH often experience inadequate treatment with health sequelae including an impaired gonadal function ( 3 ). One of the most important testicular complications in male patients with CAH is the development of testicular

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Robert A Hart Centre for Bioactive Discovery in Health and Ageing, University of New England, Armidale, New South Wales, Australia

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Robin C Dobos NSW Department of Primary Industries, Armidale, New South Wales, Australia

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Linda L Agnew Centre for Bioactive Discovery in Health and Ageing, University of New England, Armidale, New South Wales, Australia

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Neil A Smart Centre for Bioactive Discovery in Health and Ageing, University of New England, Armidale, New South Wales, Australia

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James R McFarlane Centre for Bioactive Discovery in Health and Ageing, University of New England, Armidale, New South Wales, Australia

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). Leptin is critical in reproduction, allowing pubertal development ( 23 , 24 ) as well as regulating testis development ( 25 ) and ovarian follicle development ( 26 ). Leptin is known to circulate at higher concentrations in females than males in

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Willem de Ronde Department of Internal Medicine, Spaarne Gasthuis, Haarlem, the Netherlands

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Diederik L Smit Department of Internal Medicine, Spaarne Gasthuis, Haarlem, the Netherlands

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HAARLEM study (acronym for Health risks of Anabolic Androgenic steRoid use by maLE aMateur athletes), of which the design and baseline characteristics have been published recently ( 3 ). The results of 12 months follow-up are expected soon. Based on our

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Pamela Stratton Office of the Clinical Director, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, USA

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Neelam Giri Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA

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Sonia Bhala Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA

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Martha M Sklavos Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA

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Blanche P Alter Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA

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Sharon A Savage Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA

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Ligia A Pinto Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA

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). Physical anomalies are reported in more than half of individuals with FA. Both males and females with FA have high rates of hypogonadism and infertility ( 8 , 9 , 10 , 11 ). DC is the prototype telomere biology disorder (TBD) caused by germline

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Jian Gong School of Basic Medicine, Hubei University of Chinese Medicine, Wuhan, China

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Yinjuan Lv School of Basic Medicine, Hubei University of Chinese Medicine, Wuhan, China

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Yuhao Meng Hubei University of Chinese Medicine, Wuhan, China

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Weiheng Zhang Hubei University of Chinese Medicine, Wuhan, China

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Xiaocui Jiang Hubei University of Chinese Medicine, Wuhan, China

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Min Xiao Laboratory Animal Center, Hubei University of Chinese Medicine, Wuhan, China

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their offspring's reproductive development and function and cause genetic defects ( 2 ). In humans, female exposure to stressful life events (SLE) during early gestation (18 weeks of gestation) is associated with reduced reproductive function in male

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Piera Rizzolo Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Valentina Silvestri Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Virginia Valentini Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Veronica Zelli Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Agostino Bucalo Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Ines Zanna Cancer Risk Factors and Lifestyle Epidemiology Unit, Institute for Cancer Research, Prevention and Clinical Network (ISPRO), Florence, Italy

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Simonetta Bianchi Division of Pathological Anatomy, Department of Sciences of Health, University of Florence, Florence, Italy

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Maria Grazia Tibiletti Department of Pathology, ASST Settelaghi and Centro di Ricerca per lo Studio dei Tumori Eredo-Familiari, Università dell’Insubria, Varese, Italy

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Antonio Russo Section of Medical Oncology, Department of Surgical and Oncological and Oral Sciences, University of Palermo, Palermo, Italy

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Liliana Varesco IRCCS Ospedale Policlinico San Martino, Genoa, Italy

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Gianluca Tedaldi Biosciences Laboratory, Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, Meldola, Italy

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Bernardo Bonanni Division of Cancer Prevention and Genetics IEO, European Institute of Oncology IRCCS, Milan, Italy

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Jacopo Azzollini Unit of Medical Genetics, Department of Medical Oncology and Hematology, Fondazione IRCCS Istituto Nazionale dei Tumori (INT), Milan, Italy

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Siranoush Manoukian Unit of Medical Genetics, Department of Medical Oncology and Hematology, Fondazione IRCCS Istituto Nazionale dei Tumori (INT), Milan, Italy

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Anna Coppa Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy

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Giuseppe Giannini Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Laura Cortesi Department of Oncology and Haematology, University of Modena and Reggio Emilia, Modena, Italy

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Alessandra Viel Unit of Functional Onco-Genomics and Genetics, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy

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Marco Montagna Immunology and Molecular Oncology Unit, Veneto Institute of Oncology IOV – IRCCS, Padua, Italy

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Paolo Peterlongo Genome Diagnostics Program, IFOM – The FIRC Institute of Molecular Oncology, Milan, Italy

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Paolo Radice Unit of Molecular Bases of Genetic Risk and Genetic Testing, Department of Research, Fondazione IRCCS Istituto Nazionale Tumori (INT), Milan, Italy

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Domenico Palli Cancer Risk Factors and Lifestyle Epidemiology Unit, Institute for Cancer Research, Prevention and Clinical Network (ISPRO), Florence, Italy

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Laura Ottini Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy

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Introduction Male breast cancer (MBC) is a rare disease, representing about 1% of all breast cancers (BCs) and less than 1% of all cancers in men ( 1 ). Germline pathogenic variants in BC genes, particularly BRCA1 , BRCA2 and PALB2 genes

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Carlijn A Hoekx Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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Borja Martinez-Tellez Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands
Department of Nursing Physiotherapy and Medicine, SPORT Research Group (CTS-1024), CERNEP Research Center, University of Almería, Almería, Spain
Biomedical Research Unit, Torrecárdenas University Hospital, Almería, Spain
CIBER de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Granada, Spain

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Maaike E Straat Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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Magdalena M A Verkleij Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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Mirjam Kemmeren Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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Sander Kooijman Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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Martin Uhrbom Bioscience Metabolism, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), BioPharmaceuticals R&D, AstraZeneca Gothenburg, Sweden
Department of Medicine, Huddinge, Karolinska Institutet Campus Flemingsberg, Neo Building, Huddinge, Sweden

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Saskia C A de Jager Laboratory of Experimental Cardiology, University Medical Center Utrecht, Utrecht, The Netherlands

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Patrick C N Rensen Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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Mariëtte R Boon Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, The Netherlands
Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands

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was observed in males but not in females, suggesting a potential influence of a diurnal rhythm on BAT, which may be sex-dependent. Indeed, sex differences in thermoregulation and the release of various metabolic hormones following a stimulus have

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Milou Cecilia Madsen Department of Internal Medicine and Center of Expertise on Gender Dysphoria, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands

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Martin den Heijer Department of Internal Medicine and Center of Expertise on Gender Dysphoria, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands

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Claudia Pees Walaeus Library, Leiden University Medical Center, Leiden, the Netherlands

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Nienke R Biermasz Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, the Netherlands

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Leontine E H Bakker Division of Endocrinology, Department of Medicine, Leiden University Medical Center, Leiden, the Netherlands

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concentrations in males can lead to a clinical syndrome known as male hypogonadism. This can be caused by testicular disease (primary hypogonadism) or central, pituitary, or hypothalamic disease (secondary hypogonadism). Causes can be genetic, like in Klinefelter

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