1. Division of Clinical Physiology, Institute of Cardiology, University of Debrecen, Debrecen, Hungary
2. Department of Pathophysiology, Semmelweis University, Budapest, Hungary
3. Department of Pathology, Semmelweis University, Budapest, Hungary
4. Department of Pathophysiology, Semmelweis University, Budapest, Hungary, Department of Physiology, New York Medical College, Valhalla, NY, USA,