1. Department of Dermatology University Hospital Heidelberg Heidelberg Germany
2. Cerebrovascular UnitFondazione IRCCS Istituto Neurologico “Carlo Besta” Milan Italy
3. CERVCO Centre de Référence des maladies Vasculaires rares du Cerveau et de l'Oeil Hôpital Lariboisière Paris France
4. Department of Neurology Alfried Krupp von Bohlen und Halbach Hospital Essen Germany
5. Department of Neurology Heinrich Heine University Hospital Düsseldorf Germany