1. Department of Neurology, University Hospital Zurich, Zurich, Switzerland
2. Careggi University Hospital, Florence, Italy
3. Department of Neurology, Hospital Clínico Universitario de Valladolid, Valladolid, Spain
4. MEDIAN Kinzigtal-Klinik, Bad Soden-Salmünster, Germany
5. Watford Osteopaths, London, United Kingdom
6. Department of Neurology, Leiden University Medical Centre, Leiden, the Netherlands