1. Cattedra di Andrologia, Dipartimento di Fisiopatologia Medica, Università La Sapienza (A.M.I., M.C., A.I., A.F.), 00100 Rome, Italy
2. Italian National Research Centers on Aging (F.S.), 00100 Rome, Italy
3. Cattedra di Endocrinologia, Universita’ Tor Vergata (C.M., G.F.), 00100 Rome, Italy
4. Department of Endocrinology (A.F.), St. Bartholomew’s Hospital, ECIA 7BE London, United Kingdom