1. Department of Obstetrics and Gynaecology IRCCS San Raffaele Scientific Institute Milan Italy
2. Vita‐Salute San Raffaele University Milan Italy
3. Department of Anesthesiology and Intensive Care IRCCS San Raffaele Scientific Institute Milan Italy
4. Obstetric Unit IRCCS Azienda Ospedaliero‐Universitaria di Bologna Bologna Italy
5. Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum University of Bologna Bologna Italy