1. University of Basel, Faculty of Medicine, Basel, Switzerland
2. Department of Cardiology, Clinic Gais, Gais, Switzerland
3. Department of Psychosomatic Medicine and Psychotherapy, Clinic Barmelweid, Erlinsbach, Switzerland
4. Centre of Sleep Medicine and Sleep Research, Clinic Barmelweid, Erlinsbach, Switzerland
5. Department of Oral- and Maxillofacial Surgery, Kantonsspital Aarau, Aarau, Switzerland
6. Departments of Medicine and Psychiatry, Duke University Health System, Durham, NC, USA
7. Department of Medicine, Division of Psychiatry, King Abdulaziz University, Jeddah, Saudi Arabia
8. Research Institute for Spirituality and Health (RISH), Langenthal, Switzerland