1. Department of Heart Surgery, East Slovak Institute of Cardiovascular Disease, Ltd., and Medical Faculty, University of Pavol Jozef Šafárik in Košice Košice Slovakia
2. Department of Cardiology East Slovak Institute of Cardiovascular Disease, Ltd., and Medical Faculty, University of Pavol Jozef Šafárik in Košice Košice Slovakia
3. II. Surgery Department—Cardiovascular Surgery General University Hospital and Second Faculty of Medicine, Charles University Prague Czech Republic
4. Department of Heart Surgery East Slovak Institute of Cardiovascular Disease, Ltd., St. Elizabeth College of Health and Social Work Bratislava Slovakia