1. Department of Emergency and Organ Transplantation, Urology Andrology and Kidney Transplantation Unit, University of Bari, 70124 Bari, Italy
2. St Peter's Department of Andrology, University College London Hospitals, London W1G 6BJ, UK
3. Department of Urology, Vittorio Emanuele Hospital, University of Catania, 95124 Catania, Italy