hypogonadism; t-therapy; aging; risks/benefits

* Male hypogonadism is etiologically heterogeneous, broadly classified as: primary (hypergonadotropic) hypogonadism due to testes failure (e.g. from genetic conditions, trauma or gonadotoxic insults); secondary (hypogonadotropic) hypogonadism due to hypothalamic-pituitary disorders (e.g. tumors...