1. J. Boldt, MD, Department of Anaesthesiology and Intensive Care Medicine, Justus‐Liebig‐University Giessen D‐6300 Giessen, FRG.
2. D. Kling, MD, Department of Anaesthesiology and Intensive Care Medicine, Justus‐Liebig‐University Giessen D‐6300 Giessen, FRG.
3. C. Herold, Department of Anaesthesiology and Intensive Care Medicine, Justus‐Liebig‐University Giessen D‐6300 Giessen, FRG.
4. F. Dapper, MD, Department of Cardiovascular Surgery, Justus‐Liebig‐University Giessen D‐6300 Giessen, FRG.
5. G. Hempelmann, MD, Professor, Department of Anaesthesiology and Intensive Care Medicine, Justus‐Liebig‐University Giessen D‐6300 Giessen, FRG.