1 Department of Obstetrics and Gynecology, "SS Antonio e Biagio Hospital", Alessandria, Italy.
2 Unit of Gynecology and Obstetrics, Department of Human Pathology in Adulthood and Childhood, "G. Barresi", University of Messina, Messina, Italy. Electronic address: vitalesalvatore@hotmail.com.
3 Unit of Gynecology and Obstetrics, Department of Women and Children's Health, University of Padua, Padua, Italy.
4 Department of Public Health, School of Medicine, University of Naples Federico II, Naples, Italy.
5 Department of Neuroscience, Reproductive Sciences and Dentistry, University of Naples Federico II, Naples, Italy.