1. Dept. of Internal Medicine, Kreisklinik Ebersberg, Germany
2. Dept. of Internal Medicine, Helfenstein Klinik, Geislingen, Germany
3. Dept. of Internal Medicine, KH Villingen-Schwenningen, Villingen-Schwenningen, Germany
4. Dept. of Internal Medicine, Kreisklinik Sigmaringen, Germany
5. Dept. of Internal Medicine2, Caritas-Krankenhaus, Bad Mergentheim, Germany
6. Dept. of Internal Medicine, Rems-Murr-Klinik, Winnenden, Germany
7. Dept. of Internal Medicine, Israelisches Krankenhaus, Hamburg, Germany
8. MED Facharztzentrum, Gastroenterologische Praxis, Mainz, Germany
9. Dept. of Internal Medicine1, university, Lübeck, Germany
10. Dept. of Internal Medicine2, Klinikum Ingolstadt, Germany
11. Dept. of Medicine 1, University of Erlangen, Germany