1. Department of Physiology and Martin Biomedical Centre, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Mala hora 4C, 036 01 Martin, Slovak Republic.
2. Pediatric Cardiology, Martin, Kollarova 13, 036 01 Martin, Slovak Republic.
3. Clinic of Neonatology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, University Hospital Martin, Kollarova 2, 036 59 Martin, Slovak Republic.