1. Medical Faculty, Medical University of Lodz, Lodz, Poland
2. Department of Obstetrics and Gynaecology, Polish Mother's Memorial Hospital, Lodz, Poland
3. Faculty of Health Sciences, The State University of Applied Sciences, Plock, Poland
4. Department of Prenatal Cardiology, Polish Mother's Memorial Hospital-Research Institute, Lodz, Poland
5. Department of Diagnosis and Prevention of Fetal Malformations, Medical University of Lodz, Lodz, Poland