1. National Institute of Cardiovascular Diseases-Children's Cardiac Center, Limbova Street 1; Bratislava 833 51 Slovakia
2. Department of Cardiology and Angiology; Slovak Medical University and National Institute of Cardiovascular Diseases, Pod Krasnou horkou Street 1; Bratislava 833 48 Slovakia
3. Institute of Histology and Embryology, Faculty of Medicine, Comenius University in Bratislava, Sasinkova Street 4; Bratislava 811 08 Slovakia
4. Department of Radiology; Children's University Hospital, Limbova Street 1; Bratislava 833 40 Slovakia