1. Department of Gastroenterology and Hepatology University Hospital Zurich and Zurich University Zurich Switzerland
2. Clinic for Visceral Surgery and Medicine Inselspital Bern and Bern University Bern Switzerland
3. Neurology Department of Biomedical Research Bern University HospitalUniversity of Bern Bern Switzerland
4. ISFOM ‐ Institute of Stress Diseases and Stress management Zurich Switzerland