1. Department of Pediatric Cardiology and Rheumatology, Medical University of Lodz, Sporna 36/50, 91-738 Lodz, Poland
2. Institute of Information Technology, Lodz University of Technology, 91-738 Lodz, Poland
3. Paediatric Department, Independent Public Health Care Complex in Minsk Mazowiecki, Szpitalna 37, 05-300 Warsaw, Poland