1. Institute of Informatics, University of Szeged, Szeged, 2 Árpád Square 6720, Hungary
2. 2nd Department of Internal Medicine and Cardiology Clinic, University of Szeged, Szeged, 6 Semmelweis Street 6725, Hungary
3. Department of Anesthesiology and Intensive Therapy, University of Szeged, Szeged, 6 Semmelweis Street 6725, Hungary