HypogonadismKallmann SyndromePuberty, DelayedTestosteroneHormone Replacement TherapyKlinefelter SyndromeAndropauseGonadotropinsGonadotropin-Releasing HormoneGynecomastiaEunuchismEndocrine System DiseasesDAX-1 Orphan Nuclear ReceptorReceptors, LHRHErectile DysfunctionAmenorrheaLuteinizing Hormone, beta SubunitFollicle Stimulating HormoneLeuprolideCHARGE SyndromeOlfaction DisordersLuteinizing HormoneHypopituitarismLibidoSex Hormone-Binding GlobulinHypothalamic DiseasesPubertyGonadotropins, PituitaryKisspeptinsInfertility, MaleAndrogensTestisReceptor, Fibroblast Growth Factor, Type 1SyndromeGonadal DisordersAdrenal InsufficiencyPrader-Willi SyndromeGonadal Dysgenesis, 46,XXPedigreeHyperprolactinemiaSex Chromosome AberrationsPituitary Gland