“German Adolescent Hypogonadotropic Hypogonadism Study Group”.Testicular growth and spermatogenesis: new goals for pubertal hormone replacement in boys with hypogonadotropic hypogonadism? -a multicentre prospective study of hCG/rFSH treatment outcomes during adolescence.
Rohayem J, Hauffa BP, Zacharin M, Kliesch S, Zitzmann M