Prof. Hans-Christoph Diener, Senior Professor of Clinical Neurosciences, Chair of the German Association of Neurology (DGN) Guidelines Committee, was until 2016 Director of the Department of Neurology at the University of Essen, the West German Cephalalgia Centre and the Vertigo Centre in Essen. Prof. Christian Gerloff is Director of the Department of Neurology, Medical Chief of the Head and Neurology Centre at Hamburg-Eppendorf University Hospital, and spokesman for the Hamburg Centre of Neuroscience and of the Hamburg Working Group on Stroke. Prof. Marianne Dieterich is Director of the Department of Neurology and Friedrich Baur Institute for Muscle Diseases at the University of Munich and is a member of the board of the German Vertigo and Balance Centre at Grosshadern Hospital, Munich.