1. University of Zurich, Faculty of Medicine, Zurich, Switzerland
2. Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric University Hospital Zurich, University of Zurich, Switzerland
3. Center for Psychiatry and Psychotherapy, Clinic Zugersee, Triaplus AG, Oberwil-Zug, Switzerland
4. Clinic SGM Langenthal, Clinic for Psychiatry and Psychotherapy, Langenthal, Switzerland
5. Research Institute for Spirituality and Health (RISH), Langenthal, Switzerland
6. Departments of Psychiatry and Medicine, Duke University Medical Center, Durham, USA
7. Department of Medicine, Division of Psychiatry, King Abdulaziz University, Jeddah, Saudi Arabia
8. University and University Hospital of Basel, Department for Psychosomatic Medicine, Basel, Switzerland