HypogonadismTestosteroneAndropauseMen's HealthErectile DysfunctionHormone Replacement TherapyKallmann SyndromePuberty, DelayedAndrogensLuteinizing HormoneSex Hormone-Binding GlobulinTestisGonadotropin-Releasing HormoneTestosterone PropionateFollicle Stimulating HormoneGonadotropinsDihydrotestosteroneKlinefelter SyndromeEstradiolOrchiectomyGynecomastiaEunuchismEndocrine System DiseasesGonadal Steroid HormonesLibidoLeuprolideReceptors, LHRHHypopituitarismGonadotropins, PituitaryDAX-1 Orphan Nuclear ReceptorAmenorrheaEpitestosteroneLuteinizing Hormone, beta SubunitChorionic GonadotropinPubertyCastrationVitamin A DeficiencyTestosterone CongenersPituitary GlandCHARGE Syndrome