1. Department of Visceral Surgery and Medicine, Inselspital, Bern University Hospital, University of Bern , Switzerland
2. Department of Gastroenterology and Hepatology, University Hospital Zurich and Zurich University , Switzerland
3. Neurology, Department of Biomedical Research, Bern University Hospital, University of Bern , Bern , Switzerland
4. ISFOM - Institute of Stress Diseases and Stressmanagement , Zurich , Switzerland