1. Department for Clinical Neurosciences and Preventive Medicine; Danube University Krems; Krems Austria
2. Department of Medicine; Vestre Viken Hospital Trust; Baerum Hospital; Drammen Norway
3. Karl Landsteiner University of Health Sciences; Krems Austria
4. Department of Neurology; University Hospital Tulln; Tulln Austria
5. Dasman Diabetes Center; Dasman Kuwait
6. Department of Neurology; Akershus University Hospital; Oslo Norway