1. Faculty of Health Sciences, the State University of Applied Sciences, Płock, Poland;
2. Department of Prenatal Cardiology, Polish Mother’s Memorial Hospital Research Institute, Lódz, Poland;
3. Department of Maternal Fetal Medicine, Ospedale Cristo Re Roma, Università di Roma Tor Vergata, Italy;
4. Department of Obstetrics and Gynecology The First I.M. Sechenov Moscow State Medical University, Moscow, Russia;
5. Department of Diagnoses and Prevention of Fetal Malformations, Medical University of Lodz, Poland