1. Johannes Gutenberg‐Universität, Langenbeckstraße 1, D‐55101 Mainz, Germany,
2. Department of Surgery, University of Pittsburgh School of Medicine, PA 15261, USA,
3. II. Medizinische Klinik, Krankenhaus Nordwest, Steinbacher Hohl 2–26, D‐60488 Frankfurt am Main, Germany