1. Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany
2. Department of Cardiovascular Surgery, Robert-Bosch-Hospital, 70376 Stuttgart, Germany
3. Department of Clinical Pharmacology, University of Tuebingen, 72076 Tuebingen, Germany
4. Department of Biochemistry and Pharmacy, University of Tuebingen, 72076 Tuebingen, Germany
5. Department of Laboratory Medicine and Hospital Hygiene, Robert-Bosch-Hospital, 70376 Stuttgart, Germany