1. Department of Clinical Medicine, Aarhus University, Denmark and the Fertility Clinic Skive, Skive Regional Hospital, Resenvej 25, 7800 Skive, Denmark
2. ANDROFERT, Andrology and Human Reproduction Clinic, 13075-460 Campinas, SP, Brazil
3. Department of Surgery, University of Campinas (UNICAMP), Campinas, SP, Brazil