1. Division of Maternal–Fetal Medicine Università di Roma Tor Vergata Rome Italy
2. Department of Obstetrics and Gynecology The First I.M. Sechenov Moscow State Medical University Moscow Russia
3. Department of Prenatal Cardiology Polish Mother's Memorial Hospital Research Institute Łódź Poland
4. Department of Obstetrics and Gynecology University of Foggia Foggia Italy
5. Department of Clinical Medicine, Faculty of Health Sciences The Arctic University of Norway Tromsø Norway