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Claire L Wood Department of Paediatric Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, UK
Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK

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Kieren G Hollingsworth Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK

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Edrina Bokaie Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK

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Eric Hughes Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK

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Robert Muni-Lofra Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
John Walton Muscular Dystrophy Research Centre, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK

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Anna Mayhew Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
John Walton Muscular Dystrophy Research Centre, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK

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Rod T Mitchell MRC Centre for Reproductive Health, The University of Edinburgh, Queens Medical Research Institute, Edinburgh, UK

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Michela Guglieri Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
John Walton Muscular Dystrophy Research Centre, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK

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Joseph McElvaney Department of Paediatric Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, UK

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Timothy D Cheetham Department of Paediatric Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, UK
Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK

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Volker Straub Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
John Walton Muscular Dystrophy Research Centre, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK

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, however, can result in many adverse effects including pubertal delay. Recent work at our centre has shown that incremental monthly testosterone injections can induce puberty in adolescents with DMD and delayed puberty ( 3 ). The 2-year testosterone regimen

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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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concentrations of total and free testosterone. Moreover, those males with type 2 diabetes mellitus (T2DM) and obesity or other components of the metabolic syndrome are more likely to have diminished testosterone levels than those with isolated obesity ( 19

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Muriel Houang Laboratoire des Explorations Fonctionnelles Endocriniennes, Hôpital Armand Trousseau, AP-HP Sorbonne Université, Paris, France

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Thao Nguyen-Khoa Centre Régional de Dépistage Néonatal-Ile de France, Hôpital Necker-Enfants Malades, AP-HP Centre Université de Paris, Paris, France

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Thibaut Eguether Sorbonne Université, INSERM, Centre de Recherche Saint-Antoine, Paris, France
Département de Métabolomique Clinique, Hôpital Saint-Antoine, AP-HP Sorbonne Université, Paris, France

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Bettina Ribault Sorbonne Université, INSERM, Centre de Recherche Saint-Antoine, Paris, France
Département de Métabolomique Clinique, Hôpital Saint-Antoine, AP-HP Sorbonne Université, Paris, France

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Séverine Brabant Laboratoire d’Explorations Fonctionnelles, Hôpital Necker-Enfants Malades, AP-HP Centre Université de Paris, Paris, France

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Michel Polak Centre Régional de Dépistage Néonatal-Ile de France, Hôpital Necker-Enfants Malades, AP-HP Centre Université de Paris, Paris, France
Université de Paris, INSERM, Institut IMAGINE, Hôpital Necker-Enfants Malades, AP-HP, Paris, France

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Irène Netchine Laboratoire des Explorations Fonctionnelles Endocriniennes, Hôpital Armand Trousseau, AP-HP Sorbonne Université, Paris, France
Sorbonne Université, INSERM, Centre de Recherche Saint-Antoine, Paris, France
Hôpital Armand Trousseau, AP-HP Sorbonne Université, Paris, France

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Antonin Lamazière Sorbonne Université, INSERM, Centre de Recherche Saint-Antoine, Paris, France
Département de Métabolomique Clinique, Hôpital Saint-Antoine, AP-HP Sorbonne Université, Paris, France

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, a mixture of the deuterated internal standard (IS) (150 µL containing 17-OHP-d8, testosterone-d4, D4-androstenedione (D4A)-d5, and 21-deoxycortisol (21-DF)-d8)) was added to 150 µL of serum. The solution was mixed and left standing for 5 min, and

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A Bergougnoux Service de Génétique Moléculaire et de Cytogénétique, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Montpellier, France

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L Gaspari Département d'Endocrinologie et de Gynécologie Pédiatrique, Hôpital Arnaud de Villeneuve, Université de Montpellier, Montpellier, France
INSERM Unité 1203 (DEFE), Université de Montpellier, Montpellier, France

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M Soleirol Département de Pediatrie, CHU Nîmes, France, Université de Montpellier Faculté de Médecine Montpellier-Nîmes, Montpellier, France

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N Servant Service de Génétique Moléculaire et de Cytogénétique, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Montpellier, France

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S Soskin Département de Pédiatrie, Centre Hospitalier Universitaire Hautepierre de Strasbourg, Strasbourg, France

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S Rossignol Département de Pédiatrie, Centre Hospitalier Universitaire Hautepierre de Strasbourg, Strasbourg, France

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K Wagner-Mahler Département de Pédiatrie, CHU Nice, Hôpitaux Pédiatriques de Nice CHU-Lenval, Nice, France

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J Bertherat Department of Endocrinology, French Reference Center for Rare Adrenal Disorders, Hôpital Cochin, Université Paris Cité, Institut Cochin, Assitance Publique-Hôpitaux de Paris, Paris, France

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C Sultan Département d'Endocrinologie et de Gynécologie Pédiatrique, Hôpital Arnaud de Villeneuve, Université de Montpellier, Montpellier, France

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N Kalfa Department of Pediatric Urological Surgery, French Reference Center for abnormalities of Genital Development (DevGen), CHU Lapeyronie, Montpellier University, Montpellier, France

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F Paris Service de Génétique Moléculaire et de Cytogénétique, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, Montpellier, France
Département d'Endocrinologie et de Gynécologie Pédiatrique, Hôpital Arnaud de Villeneuve, Université de Montpellier, Montpellier, France
INSERM Unité 1203 (DEFE), Université de Montpellier, Montpellier, France

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of testosterone and gonadotropins in plasma. Moreover, quantification of plasma 17-hydroxyprogesterone, and possibly of other androgens (e.g. delta-4 androstenedione (A4) and dehydroepiandrosterone sulfate (DHEA-S)), and abdominopelvic ultrasonography

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Marie Lindhardt Ljubicic Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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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Trine Holm Johannsen Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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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Margit Bistrup Fischer Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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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Emmie N Upners Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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 S Busch Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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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Katharina M Main Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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
Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark

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Anna-Maria Andersson Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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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Casper P Hagen Department of Growth and Reproduction, Copenhagen University Hospital – Rigshospitalet, 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, Copenhagen University Hospital – Rigshospitalet, 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
Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark

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simply obtained by dividing the LH concentrations (nominator) by the FSH concentrations (denominator). For concentrations below LOD, the ratios were calculated using the LOD/2 for the corresponding hormone. In a single patient, we report testosterone

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Yijun Tang Department of Endocrinology and Metabolism, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Yao Chen Department of Endocrinology and Metabolism, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Jiayi Wang Department of Urology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Qianwen Zhang Department of Endocrinology and Metabolism, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Yirou Wang Department of Endocrinology and Metabolism, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Yufei Xu Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Xin Li Department of Endocrinology and Metabolism, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Jian Wang International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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Xiumin Wang Department of Endocrinology and Metabolism, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

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underwent basic laboratory tests, including testosterone, estrogen, follicle-stimulating hormone (FSH), luteinizing hormone (LH), and gonadotropin-releasing hormone (GnRH) stimulation tests, and imaging examinations including bone age ( 13 ), pelvic

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Martin Bidlingmaier Medizinische Klinik und Poliklinik IV, LMU Klinikum, Ludwig-Maximilians University, Munich, Germany

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Helena Gleeson Department of Endocrinology, Queen Elizabeth Hospital, Birmingham, UK

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Ana-Claudia Latronico Department of Internal Medicine, Discipline of Endocrinology and Metabolism, Sao Paulo Medical School, University of Sao Paulo, Sao Paulo, Brazil

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Martin O Savage Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, London, UK

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-dominant, peripheral precocious puberty. It is usually recognised by progressive virilisation, linear growth acceleration, skeletal maturation and pubertal testosterone levels. We have described the clinical and hormonal follow-up of a boy with testotoxicosis, who was

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Nathalia G B P Ferreira Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Joao L O Madeira Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Peter Gergics Laboratório de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil

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Renata Kertsz Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Juliana M Marques Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Nicholas S S Trigueiro Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Anna Flavia Figueredo Benedetti University of Michigan Medical School, Department of Human Genetics, Ann Arbor, Michigan, United States

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Bruna V Azevedo Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Bianca H V Fernandes Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil
Universidade de São Paulo, Zebrafish Facility, São Paulo, São Paulo, Brazil

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Debora D Bissegatto Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Isabela P Biscotto Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Qing Fang Laboratório de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil

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Qianyi Ma Laboratório de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil

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Asye B Ozel Laboratório de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil

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Jun Li Laboratório de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil

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Sally A Camper Laboratório de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil

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Alexander A L Jorge Unidade de Endocrinologia Genética, Laboratório de Endocrinologia Celular e Molecular LIM25, Disciplina de Endocrinologia da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil

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Berenice B Mendonça Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Ivo J P Arnhold Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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Luciani R Carvalho Unidade de Endocrinologia do Desenvolvimento, Laboratório de Hormônios e Genética Molecular LIM42, Disciplina de Endocrinologia, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil

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(FSH), tri-iodothyronine, thyroxine (T 4 ), free T 4 , dehydroepiandrosterone sulfate, estradiol, or testosterone were measured at baseline as previously described ( 7 ). Clonidine and combined pituitary stimulation tests (0.05–0.1 U/kg insulin, 200 μg

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