1. Hephata Klinik; Schwalmstadt-Treysa Germany
2. Department of Neurology; Philipps-Universität Marburg; Marburg Germany
3. Department of Neurology; University of Rostock; Rostock Germany
4. Department for Sleep Medicine and Neuromuscular Disorders; University of Münster; Münster Germany
5. Charité-Universitätsmedizin Berlin; Berlin Germany