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D Santi Unit of Endocrinology, Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
Unit of Endocrinology, Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy

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A R M Granata Unit of Endocrinology, Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy

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M Simoni Unit of Endocrinology, Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
Unit of Endocrinology, Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy

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ART (8) . The outcome of ICSI seems to be influenced by sperm structure and quality (9) . Thus, it seems reasonable that an improvement in sperm quality could effect ICSI outcomes. The empirical administration of follicle stimulating hormone (FSH) to

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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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Introduction Luteinizing hormone (LH) and follicle-stimulating hormone (FSH), both produced in the gonadotropic cells of the anterior pituitary gland, have recently been described as an excellent marker of sex when combined in the LH/FSH ratio

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David Mark Robertson Department of Molecular and Translational Sciences, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
School of Women’s & Children’s Health, Discipline of Obstetrics and Gynaecology, University of New South Wales, Sydney, Australia

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Chel Hee Lee Clinical Research Support Unit, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

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Angela Baerwald Department of Obstetrics, Gynecology & Reproductive Sciences, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

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Introduction It is well recognised that ovarian hormones exert a strong inhibitory effect on the pituitary secretion of FSH and LH, as reflected by a 6- to 12-fold increase in the human pituitary secretion of FSH and LH after ovariectomy ( 1

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Yanling Cai Department of Nuclear Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China

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Yan Yang Department of Nuclear Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China

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Xiao Pang Department of Nuclear Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China

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Suping Li Department of Nuclear Medicine, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China

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outcomes included the following: (i) any measure of sperm, including sperm concentration, total sperm count, semen volume, sperm viability, or sperm morphology; (ii) any measurement follicle-stimulating hormone (FSH), luteinizing hormone (LH), testosterone

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Clara Lundetoft Clausen Center of Research & Disruption of Infectious Diseases, Department of Infectious Diseases, Copenhagen University Hospital – Amager and Hvidovre, Hvidovre, Denmark
Department of Infectious Diseases, Copenhagen University Hospital – Amager and Hvidovre, Hvidovre, Denmark

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Trine Holm Johannsen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Niels Erik Skakkebæk Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Hanne Frederiksen Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Camilla Koch Ryrsø Department of Pulmonary and Infectious Diseases, Copenhagen University Hospital – Nordsjælland, Hillerød, Denmark
Centre for Physical Activity Research, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Arnold Matovu Dungu Department of Pulmonary and Infectious Diseases, Copenhagen University Hospital – Nordsjælland, Hillerød, Denmark

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Maria Hein Hegelund Department of Pulmonary and Infectious Diseases, Copenhagen University Hospital – Nordsjælland, Hillerød, Denmark

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Daniel Faurholt-Jepsen Department of Infectious Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Rikke Krogh-Madsen Department of Infectious Diseases, Copenhagen University Hospital – Amager and Hvidovre, Hvidovre, Denmark
Centre for Physical Activity Research, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark

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Birgitte Lindegaard Department of Pulmonary and Infectious Diseases, Copenhagen University Hospital – Nordsjælland, Hillerød, Denmark
Centre for Physical Activity Research, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Allan Linneberg Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
Center for Clinical Research and Prevention, Copenhagen University Hospital – Bispebjerg and Frederiksberg, Copenhagen, Denmark

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Line Lund Kårhus Center for Clinical Research and Prevention, Copenhagen University Hospital – Bispebjerg and Frederiksberg, Copenhagen, Denmark

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Anders Juul Department of Growth and Reproduction, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Thomas Benfield Center of Research & Disruption of Infectious Diseases, Department of Infectious Diseases, Copenhagen University Hospital – Amager and Hvidovre, Hvidovre, Denmark
Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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to 25% at age>70 years) ( 10 ). In this context, we studied concentrations of testosterone, estrone sulfate, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) among patients hospitalized with COVID-19, and their impact on mortality and

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Wolfgang Koechling Ferring Pharmaceuticals A/S, Copenhagen, Denmark

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Daniel Plaksin Bio-Technology General Israel Ltd, Ferring Pharmaceuticals, Kiryat Malachi, Israel

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Glenn E Croston Croston Consulting, San Diego, California, USA

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Janni V Jeppesen The Laboratory of Reproductive Biology, The Department of Fertility at The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital and The University of Copenhagen, Copenhagen, Denmark

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Kirsten T Macklon The Laboratory of Reproductive Biology, The Department of Fertility at The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital and The University of Copenhagen, Copenhagen, Denmark

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Claus Yding Andersen The Laboratory of Reproductive Biology, The Department of Fertility at The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital and The University of Copenhagen, Copenhagen, Denmark

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Introduction Follicle-stimulating hormone (FSH) released from the anterior pituitary in response to gonadotropin-releasing hormone (GnRH) plays a central role in reproduction in women, driving the growth and maturation of ovarian follicles

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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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androgen concentrations may directly suppress luteinizing hormone (LH) and indirectly suppress follicle-stimulating hormone (FSH) by their aromatization to estradiol. The evaluation of Leydig and Sertoli cells has traditionally included measurements of

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Eleftherios E Deiktakis Laboratory of Clinical Chemistry, School of Medicine, University of Crete, Heraklion, Greece

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Eleftheria Ieronymaki Laboratory of Clinical Chemistry, School of Medicine, University of Crete, Heraklion, Greece

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Peter Zarén Department of Translational Medicine, Lund University, Malmö, Sweden

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Agnes Hagsund Department of Translational Medicine, Lund University, Malmö, Sweden

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Elin Wirestrand Department of Translational Medicine, Lund University, Malmö, Sweden

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Johan Malm Department of Translational Medicine, Lund University, Malmö, Sweden

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Christos Tsatsanis Laboratory of Clinical Chemistry, School of Medicine, University of Crete, Heraklion, Greece

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Ilpo T Huhtaniemi Department of Translational Medicine, Lund University, Malmö, Sweden
Imperial College London, Institute of Reproductive and Developmental Biology, London, UK

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Aleksander Giwercman Department of Translational Medicine, Lund University, Malmö, Sweden
Malmö University Hospital, Reproductive Medicine Center, Malmö, Sweden

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Yvonne Lundberg Giwercman Department of Translational Medicine, Lund University, Malmö, Sweden

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(LH), a potential caveat is the rebound of follicle-stimulating hormone (FSH) after its initial suppression. In contrast, the recently introduced GnRH antagonists provide permanent suppression of both gonadotropins ( 2 ), which may offer a therapeutic

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Kaisu Luiro Department of Obstetrics and Gynecology, Reproductive Medicine Unit, Helsinki University Hospital and University of Helsinki, Helsinki, Finland

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Kristiina Aittomäki Department of Medical Genetics, Helsinki University Hospital, Helsinki, Finland

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Pekka Jousilahti Department of Public Health Solutions, National Institute for Health and Welfare, Helsinki, Finland

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Juha S Tapanainen Department of Obstetrics and Gynecology, Reproductive Medicine Unit, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
Department of Obstetrics and Gynecology, University of Oulu and Oulu University Hospital, Medical Research Center, PEDEGO Research Unit, Oulu, Finland

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levels of FSH and low estradiol and anti-Müllerian hormone (AMH) levels. The etiology of POI is heterogeneous with a significant genetic contribution ( 2 ). Ten to fifteen percent of POI patients have an affected first-degree relative ( 3 ). Autosomal

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Teodoro Durá-Travé Department of Pediatrics, School of Medicine, University of Navarra, Pamplona, Spain
Department of Pediatrics, Navarra Hospital Complex, Pamplona, Spain
Navarra Institute for Health Research (IdisNA), Pamplona, Spain

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Fidel Gallinas-Victoriano Department of Pediatrics, Navarra Hospital Complex, Pamplona, Spain

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María Malumbres-Chacon Department of Pediatrics, Navarra Hospital Complex, Pamplona, Spain

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Lotfi Ahmed-Mohamed Department of Pediatrics, Navarra Hospital Complex, Pamplona, Spain

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María Jesús Chueca -Guindulain Department of Pediatrics, Navarra Hospital Complex, Pamplona, Spain
Navarra Institute for Health Research (IdisNA), Pamplona, Spain

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Sara Berrade-Zubiri Department of Pediatrics, Navarra Hospital Complex, Pamplona, Spain
Navarra Institute for Health Research (IdisNA), Pamplona, Spain

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performed by determining serum LH and FSH at baseline (between 8:00 h and 9:00 h after an overnight fast) and 4 h post subcutaneous administration of GnRH analog (leuprorelin, 500 µg). LH and follicular stimulating hormone (FSH) were measured by highly

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