1 Department of Obstetrics and Gynecology, Ente Ospedaliere Cantonale, University of the Italian Switzerland, Via Tesserete 46, 6900, Lugano, Switzerland. stefania.triunfo@eoc.ch.
2 Department of Obstetrics and Gynecology, Ente Ospedaliere Cantonale, University of the Italian Switzerland, Via Tesserete 46, 6900, Lugano, Switzerland.