1 Department of Obstetrics and Gynaecology, University Hospitals Dorset, Poole, UK.
2 Research Center for Reproductive Medicine, Gynecological Endocrinology and Menopause, Obstetrics and Gynecology Unit, IRCCS S. Matteo Foundation, University of Pavia, Pavia, Italy.
3 Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy.