1. Endocrinology Unit, Maggiore-Bellaria Hospital, Medical Department, Azienda-Usl Bologna, Bologna, Italy
2. Sexual Medicine and Andrology Unit, Department of Experimental, Clinical and Biomedical Sciences, University of Florence, Florence, Italy
3. Department of Psychology, University of Zurich, Zurich, Switzerland
4. Endocrinology, Andrology and Medical Sexology, Department of Systems Medicine, Tor Vergata University of Rome, Rome, Italy