1. Pain Relief Unit, Department of Anesthesia; Hadassah Hebrew University Hospital; Jerusalem Israel
2. Department of Nutrition and Food Sciences - Food Chemistry; University of Bonn; Endenicher Allee 11-13 53115 Bonn Germany
3. Institut Prof. Dr. Kurz GmbH; Eupener Strasse 161 50933 Köln Germany
4. Institute of Forensic Medicine; University of Freiburg; Albertstr. 9 79104 Freiburg Germany