Maurizio Serati1, Jvan Casarin2, Andrea Braga2. 1. Department of Obstetrics and Gynecology, University of Insubria, Varese, Italy; Department of Obstetrics and Gynecology, EOC - Beata Vergine Hospital, Mendrisio, Switzerland. Electronic address: mauserati@hotmail.com. 2. Department of Obstetrics and Gynecology, University of Insubria, Varese, Italy; Department of Obstetrics and Gynecology, EOC - Beata Vergine Hospital, Mendrisio, Switzerland.