HypogonadismKallmann SyndromePuberty, DelayedTestosteroneAge of OnsetHormone Replacement TherapyKlinefelter SyndromeAndropauseGonadotropinsGonadotropin-Releasing HormoneGynecomastiaEunuchismEndocrine System DiseasesDAX-1 Orphan Nuclear ReceptorReceptors, LHRHErectile DysfunctionAmenorrheaLuteinizing Hormone, beta SubunitPedigreeFollicle Stimulating HormoneLeuprolideCHARGE SyndromeLuteinizing HormoneOlfaction DisordersHypopituitarismLibidoSex Hormone-Binding GlobulinCerebellar AtaxiaHypothalamic DiseasesSyndromePubertyGonadotropins, PituitaryKisspeptinsInfertility, MaleMutationTestisAndrogensReceptor, Fibroblast Growth Factor, Type 1Gonadal DisordersAdrenal InsufficiencyPrader-Willi SyndromeGonadal Dysgenesis, 46,XXHyperprolactinemiaSex Chromosome AberrationsPituitary GlandPhenotype