1. Outpatient Clinic for Internal Medicine, Gastroenterology and Japanese Medicine, Gräfelfing/München, Germany
2. Medizinische Klinik, Krankenhaus Vilsbiburg, Vilsbiburg, Germany
3. Department for Gastroenterology and Internal Medicine, Klinikum Hann. Münden, Hann. Münden, Germany
4. Department of Gastroenterology and GI-Oncology, University Medical Center Göttingen, Göttingen, Germany
5. G. Pohl-Boskamp GmbH und Co KG, Hohenlockstedt, Germany