1. Department of Public Health, University of Naples Federico II, Via Sergio Pansini, 80131 Naples, Italy
2. Merck Serono S.p.A., 00176 Rome, Italy
3. IRCCS San Raffaele Hospital, 00163 Milan, Italy
4. Unit of Endocrinology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41121 Modena, Italy
5. Department of Neuroscience, Reproductive Science and Odontostomatology, University of Naples Federico II, Via Sergio Pansini, 80131 Naples, Italy
6. Department of Obstetrics and Gynecology and Physiopathology of Human Reproduction, ASL Salerno, 84124 Salerno, Italy
7. Azienda Ospedaliera Universitaria Federico II di Napoli, 80131 Naples, Italy
8. Faculty of Medicine, Department of Surgery and Cancer, London W12 0NN, UK
9. Institute of Biomedicine, University of Turku, 20014 Turku, Finland
10. Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
11. Fertility Clinic at Skive Regional Hospital, Faculty of Health, Aarhus University, 8000 Aarhus, Denmark