1. Philipps-University Marburg; Department of Neurology; Marburg Germany
2. Saarland University; Department of Neurology; Homburg Germany
3. The Sahlgrenska Academy at the University of Gothenburg; Institute of Neuroscience and Physiology; Department of Psychiatry and Neurochemistry; Mölndal Sweden
4. University Leipzig; Department of Visceral, Transplantation, Thoracic and Vascular Surgery; Leipzig Germany
5. Sankt Gertrauden Krankenhaus; Department of Trauma Surgery and Orthopedy; Berlin Germany
6. Klinikum Lippe; Department of Internal Medicine; Division of Gastroenterology; Detmold Germany
7. Somnomar; Institute for Medical Research and Sleep Medicine Marburg; Marburg Germany
8. Neurocentro della Svizzera Italiana; Ospedale Regionale di Lugano; Lugano Switzerland
9. Hephata-Clinic for Neurology and Psychiatry; Schwalmstadt-Treysa Germany
10. Philipps-University Marburg; Department of Internal Medicine; Division of Endocrinology and Diabetology; Marburg Germany