1. Cattedra di Andrologia (M.C., A.M.I., A.F.), Universita’ La Sapienza, Policlinico Umberto I, 00161, Rome, Italy
2. Laboratory of Neurophysiology (A.R.C.), National Institutes of Mental Health, National Institutes of Health, Bethesda, Maryland 20892
3. Cattedra di Endocrinologia (C.M.), Universita’ Tor Vergata, 00100 Rome, Italy
4. Endocrinology and Reproduction Research Branch (M.L.D.), National Institutes of Child Health and Development, National Institutes of Health, Bethesda, Maryland 20892
5. The Department of Endocrinology (A.F.), St. Bartholomew’s Hospital, EC1A 7BE London, United Kingdom