1. 1. Department of Prenatal Cardiology, Polish Mother’s Memorial Hospital Research Institute
2. 2. Department of Cardiology, Polish Mother’s Memorial Research Institute
3. 3. Department of Obstetrics and Gynecology, Polish Mother’s Memorial Hospital Research Institute
4. 4. Department of Neonatology, Polish Mother’s Memorial Hospital Research Institute
5. 5. Institute of Health Sciences, The State School of Higher Professional Education in Płock, Poland