1. Department of Prenatal Cardiology, Polish Mother Memorial Hospital Research Institute, Lodz, Poland;
2. Faculty of Health Sciences, The State University of Applied Sciences in Płock, Płock, Poland;
3. Department of Maternal Fetal Medicine, Università Roma Tor Vergata, Rome, Italy;
4. Department of Anesthesiology and Intensive Medical Therapy, Polish Mother Memorial Hospital Research Institute, Lodz, Poland;
5. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Rochester Medical Center, Rochester (NY), USA;
6. Department of Diagnoses and Prevention Fetal Malformations Medical University of Lodz, Lodz, Poland