An excellent series of article on hypogonadism in the BMJ.

Smith N, Quinton R. Kallmann syndrome. BMJ 2012;345:e6971

Anonymous, Bhartia M, Ramachandran S. Klinefelter’s syndrome—a diagnosis mislaid for 46 years. BMJ 2012;345:e6938 (note the typo in the Clinicians’ perspective: “hypogonadotrophic hypogonadism” should read “hypergonadotrophic hypogonadism”)

Blevins CH ,Wilson ME. Klinefelter’s syndrome. BMJ 2012;345:e7558

Pitteloud N. Managing delayed or altered puberty in boys. BMJ 2012;345:e7913