1 Operative Unit of Endocrinology, Department of Medicine-DIMED; University of Padova, Padova, Italy.
2 Unit of Andrology and Reproductive Medicine & Centre for Male Gamete Cryopreservation, Department of Medicine-DIMED, University of Padova, Padova, Italy.
3 Division of Endocrinology, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy.