1 III. Department of Internal Medicine, Szabolcs - Szatmár - Bereg County Hospitals and University Teaching Hospital, Szent István út 68., 4400 Nyíregyháza, Hungary.
2 Institute of Cardiology, University of Debrecen Medical Center, Móricz Zs. krt. 22., 4032 Debrecen, Hungary.
3 Aladár Petz County Teaching Hospital, Győr, Hungary.
4 Heart Institute, Medical School, University of Pécs, Pécs, Hungary.
5 GE Healthcare Limited, Pharmaceutical Diagnostics, Pollards Wood, United Kingdom.
6 Institute of Cardiology, University of Debrecen Medical Center, Móricz Zs. krt. 22., 4032 Debrecen, Hungary. koszegi@med.unideb.hu.