1. Department of Internal Medicine I, Ulm University, Albert-Einstein-Allee 23, D-89081 Ulm, Germany
2. Department of Cellular and Molecular Medicine, Katholieke Universiteit Leuven, Campus Gasthuisberg O/N1 - Herestraat 49 bus 901, 3000 Leuven (Belgium)
3. Department for Animal Breeding and Biotechnology, LMU Munich, Gene Center, Feodor-Lynen- Str. 25, D-81377 Munich, Germany
4. Department of Visceral Surgery, Ulm University, Albert-Einstein-Allee 23, D-89081 Ulm, Germany