1. Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Budapest, Hungary
2. Department of Cardiovascular Surgery, Semmelweis University, Budapest, Hungary
3. Department of Cardiac Surgery, University of Debrecen, Debrecen, Hungary
4. Department of Anesthesiology, Investigational Intensive Care Unit, The University of Texas Medical Branch, TX, U.S.A.