1. Center for Prenatal Diagnostics; Opole Poland
2. Dobreusg Ultrasound Group Practice; Krakow Poland
3. Departments of Gynecology and Obstetrics; Jagiellonian University; Krakow Poland
4. Polish Mother's Memorial Hospital Research Institute; Lodz Poland
5. Profemi Private Practice; Krotoszyn Poland
6. Departments of Pediatric Cardiology; Jagiellonian University; Krakow Poland
7. Department of Gynecology and Obstetrics; Frederic Chopin Clinical District Hospital No. 1; Rzeszow Poland