1. Department of Neurology; University Hospital; Medical Faculty Heinrich-Heine-University; Düsseldorf Germany
2. Novartis Pharma; Nürnberg Germany
3. Institute of Virology; University Hospital; Heinrich-Heine-University; Düsseldorf Germany
4. Institute of Medical Microbiology and Hospital Hygiene; University Hospital; Heinrich-Heine-University; Düsseldorf Germany
5. Department of Neurology; University Hospital of Cologne; Cologne Germany
6. Department of Gastroenterology, Hepatology and Infectious Diseases; University Hospital; Heinrich-Heine-University; Düsseldorf Germany
7. Department of Neurology; University Hospital of Münster; Münster Germany