1. Department of Obstetrics and Gynecology (F.M.R.), University of Minas Gerais, Belo Horizonte 30130-100, Brazil
2. Department of Obstetrics and Gynecology (D.D.), University of Padua, 35128 Padua, Italy
3. Chair of Obstetrics and Gynecology (F.P.), University of Siena, 53100 Siena, Italy