1. Department of Obstetrics and Gynecology; Medical University of Silesia; Katowice Poland
2. Perinatal Cardiology, All Children's Hospital, Pediatrix Medical Group; University of Florida; St Petersburg FL USA
3. Women's Health and Perinatology Research Group, Department of Clinical Medicine, Faculty of Health Sciences; UiT - The Arctic University of Norway; Tromsø Norway
4. Department of Obstetrics and Gynecology; University Hospital of Northern Norway; Tromsø Norway