1. Department of Thoracic and Cardiovascular Surgery, Division of Thoracic Transplantation, West German Heart Center, University Hospital Essen, Essen, Germany
2. Department of Cardiothoracic Surgery, Center of Cardiology, University Hospital Cologne, Cologne, Nordrhein-Westfalen, Germany
3. Institut für Physiologische Chemie, Universitätsklinikum Essen, Essen, Nordrhein-Westfalen, Germany
4. Department of Veterinary Clinical Sciences, Swine Clinic, Justus-Liebig-University, Giessen, Hessen, Germany