1. Unit of Obstetrics and Gynecology, Department of Clinical Sciences, Hospital Luigi Sacco, and Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Department of Medicine and Medical Specialties, University of Milan, Milan, Italy
2. IRCCS Policlinico, Mangiagalli and Regina Elena Foundation, Milan, Italy
3. Ostetrica e Ginecologia, Ospedale Luigi Sacco, Via G.B. Grassi 74, 20157 Milano, Italy,