1. Preventive Gynecology Unit, European Institute of Oncology IRCCS, Via Ripamonti 435, 20141 Milan, Italy
2. Unit of Obstetrics and Gynecology, ASST Fatebenefratelli-Sacco, Department of Biological and Clinical Sciences L. Sacco, University of Milan, 20157 Milan, Italy
3. Division of Epidemiology and Biostatistics, IEO European Institute of Oncology IRCCS, Via Ripamonti 435, 20141 Milan, Italy
4. Department of Biomedical Sciences, University of Sassari, 07100 Sassari, Italy