1. Department of Neuroscience, Reproductive Science and Odontostomatology, University of Naples Federico II, Italy
2. Istituto per l‘Endocrinologia e l‘Oncologia Sperimentale, Consiglio Nazionale delle Ricerche, Napoli, Italy
3. Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, and Azienda Ospedaliera-Universitaria di Modena, Italy
4. Androfert, Andrology and Human Reproduction Clinic, and Department of Surgery (Division of Urology), University of Campinas (UNICAMP), Campinas, SP, Brazil
5. Laboratory of Reproductive Biology, University Hospital of Copenhagen, Faculty of Health and Medical Sciences, Copenhagen, Denmark
6. Fertility Clinic, Skive Regional Hospital, Skive, Denmark, and Faculty of Health, Aarhus University, Aarhus, Denmark
7. Medical Statistics Unit, University of Campania “Luigi Vanvitelli”, Naples, Italy