1. Andrology Unit, Endocrinology, Department of Clinical and Molecular Sciences; Umberto I Hospital, School of Medicine, Polytechnic University of Marche; Ancona Italy
2. Center for Reproductive Medicine, Glickman Urological and Kidney Institute, Cleveland Clinic; Cleveland OH USA
3. Andrology Pathophysiology of Reproduction and Endocrine Diagnosis Unit; Policlinic Umberto I, University of Rome ‘‘La Sapienza’’; Rome Italy