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Rebeca Esquivel-Zuniga Department of Pediatrics, University of Virginia, Charlottesville, Virginia, USA

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Alan D Rogol Department of Pediatrics, University of Virginia, Charlottesville, Virginia, USA

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hypogonadotropic hypogonadism, primary hypogonadism and functional hypogonadism, which must be considered in adolescents with DP. Hypogonadism and its medical and psychological consequences can be underestimated or overlooked in patients with chronic illness

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Nandini Shankara Narayana Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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Lam P Ly Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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Veena Jayadev Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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Carolyn Fennell Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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Sasha Savkovic Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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Ann J Conway Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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David J Handelsman Andrology Department, Concord Hospital and, ANZAC Research Institute, University of Sydney, Sydney, Australia

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data of patients. Men were divided into primary (hypergonadotrophic), secondary (hypogonadotrophic) hypogonadism or transmen groups with the causes of hypogonadism described previously ( 14 ). Injections were administered by experienced nurses

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Shruti Khare Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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Anurag R Lila Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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Hiren Patt Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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Chaitanya Yerawar Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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Manjunath Goroshi Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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Tushar Bandgar Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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Nalini S Shah Department of Endocrinology, Seth GS Medical College and KEM Hospital, Parel, Mumbai 400012, India

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=45/50) had resumption of regular menses. In the male patients where baseline biochemistry was available, 62.5% ( n =20/32) had recovery of hypogonadism i.e., normalisation of testosterone. Twelve patients who were referred post-primary TSS had

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Rui-yi Tang Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, People’s Republic of China

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Rong Chen Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, People’s Republic of China

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Miao Ma Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, People’s Republic of China

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Shou-qing Lin Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, People’s Republic of China

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Yi-wen Zhang Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, People’s Republic of China

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Ya-ping Wang Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, People’s Republic of China

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Introduction Idiopathic hypogonadotropic hypogonadism (IHH) is also known as congenital hypogonadotropic hypogonadism. This rare clinically and genetically heterogeneous disorder is characterized by complete or partial pubertal failure, which

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Luca Persani Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
Department of Endocrinology and Metabolic Diseases, IRCCS Istituto Auxologico Italiano, Milan, Italy

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Martine Cools Departments of Internal Medicine and Paediatrics and of Paediatric Endocrinology, Ghent University Hospital, Ghent, Belgium

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Stamatina Ioakim Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy

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S Faisal Ahmed Developmental Endocrinology Research Group, School of Medicine, Dentistry & Nursing, University of Glasgow, Glasgow, United Kingdom

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Silvia Andonova National Genetic Laboratory, UHOG “Maichin dom", Medical University, Sofia, Bulgaria

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Magdalena Avbelj-Stefanija Department for Pediatric Endocrinology, Diabetes and Metabolic Diseases, University Children's Hospital, University Medical Centre Ljubljana, Ljubljana, Slovenia

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Federico Baronio Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy

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Jerome Bouligand Université Paris-Saclay, Inserm UMRS1185 & Service de Génétique Moléculaire, Pharmacogénétique et Hormonologie, Hôpital Bicêtre, France

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Hennie T Bruggenwirth Department of Clinical Genetics, Erasmus MC, University Medical Center, Rotterdam, The Netherlands

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Justin H Davies Faculty of Medicine, University of Southampton, Southampton, United Kingdom

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Elfride De Baere Departments of Internal Medicine and Paediatrics and of Paediatric Endocrinology, Ghent University Hospital, Ghent, Belgium

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Iveta Dzivite-Krisane Children’s University Hospital, Riga, Latvia

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Paula Fernandez-Alvarez Department of Clinical and Molecular Genetics, Vall d'Hebron University Hospital, Barcelona, Spain

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Alexander Gheldof Center for Medical Genetics, Vrije Universiteit Brussel, Universitair Ziekenhuis Brussel, Brussels, Belgium

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Claudia Giavoli Unit of Endocrinology, Fondazione IRCCS Ospedale Maggiore Policlinico, Milano, Italy
Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy

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Claus H Gravholt Departments of Endocrinology, of Clinical Medicine and of Molecular Medicine, Aarhus University, Aarhus, Denmark

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Olaf Hiort University Hospital Schleswig-Holstein, Campus Lübeck, and University of Lübeck, Lübeck, Germany

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Paul-Martin Holterhus University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany

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Anders Juul Departments of Growth and Reproduction and of Clinical Medicine, Copenhagen University Hospital – Rigshospitalet, Copenhagen, Denmark

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Csilla Krausz Endocrinology and Andrology Units, University Hospital of Careggi and Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy

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Kristina Lagerstedt-Robinson Department of Clinical Genetics, Karolinska University Laboratory, Karolinska University Hospital, Stockholm, Sweden

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Ruth McGowan Developmental Endocrinology Research Group, School of Medicine, Dentistry & Nursing, University of Glasgow, Glasgow, United Kingdom
West of Scotland Centre for Genomic Medicine, Queen Elizabeth University Hospital, Glasgow, United Kingdom

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Uta Neumann Charité Medicine University, Berlin, Germany

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Antonio Novelli Translational Cytogenomics Research Unit, Bambino Gesù Children's Hospital IRCCS, Rome, Italy

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Xavier Peyrassol Universitè Libre di Bruxelles, Brussels, Belgium

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Leonidas A Phylactou Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus

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Julia Rohayem University Hospital Münster, Munster, Germany

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Philippe Touraine Center for Rare Endocrine and Gynecological Disorders, Department of endocrinology and reproductive Medicine, Hospital Pitié Salpêtrière, Paris, France

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Dineke Westra Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands

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Valeria Vezzoli Department of Endocrinology and Metabolic Diseases, IRCCS Istituto Auxologico Italiano, Milan, Italy

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Raffaella Rossetti Department of Endocrinology and Metabolic Diseases, IRCCS Istituto Auxologico Italiano, Milan, Italy

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hypogonadism (CHH) or unexplained 46,XX primary ovarian insufficiency (POI). These conditions are rare, with variable and complex aetiology, and their differential diagnosis using only clinical and biochemical parameters may be difficult ( 3 ). Therefore, NGS

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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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L M Mongioì Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy

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R A Condorelli Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy

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S La Vignera Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy

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A E Calogero Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy

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Introduction Adrenal insufficiency (AI) is a disease caused by either primary adrenal failure (Addison’s disease, over 90% due to autoimmune adrenalitis) ( 1 ) or by hypothalamic–pituitary impairment of the corticotropic axis alone or in

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Giuseppe Grande Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy

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Andrea Graziani Department of Medicine, University of Padova, Padova, Italy

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Antonella Di Mambro Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy

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Riccardo Selice Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy

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Alberto Ferlin Unit of Andrology and Reproductive Medicine, University Hospital of Padova, Padova, Italy
Department of Medicine, University of Padova, Padova, Italy

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consensus nowadays is that 25-OH-D3 levels might represent a marker of Leydig cell function, being reduced not only in men with low testosterone (both primary and secondary hypogonadism) but also in men with subclinical hypogonadism. Vitamin D is essential

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Amar Osmancevic School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Kristin Ottarsdottir School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Margareta Hellgren School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Ulf Lindblad School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Bledar Daka School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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. ( https://doi.org/10.2164/jandrol.111.015065 ) 27 Tajar A Forti G O’Neill TW Lee DM Silman AJ Finn JD Bartfai G Boonen S Casanueva FF Giwercman A , Characteristics of secondary, primary, and compensated hypogonadism in aging men

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Mikkel Andreassen Department of Endocrinology, Faculty of Health Science, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Anders Juul Department of Growth and Reproduction, Faculty of Health Science, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Ulla Feldt-Rasmussen Department of Endocrinology, Faculty of Health Science, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Niels Jørgensen Department of Growth and Reproduction, Faculty of Health Science, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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gonadotropins have been documented in other clinical conditions such as anorexia nervosa ( 34 ), polycystic ovarian disease ( 35 ) and primary male hypogonadism ( 36 ). Thus, as for TSH, immunoreactive FSH and LH may not reflect FSH and LH bioactivity in

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