1. Department of Neuroscience, Mayo Clinic, Jacksonville, Florida, USA
2. Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway
3. Department of Neurology, St. Olav's Hospital, Trondheim, Norway
4. Department of Neurology, Mayo Clinic, Scottsdale, Arizona, USA
5. Department of Neurology, Mayo Clinic, Jacksonville, Florida, USA
6. Department of Neurology, Collegium Medicum, Jagiellonian University, Krakow, Poland
7. Department of Neurology, Mater Misericordiae Hospital, Dublin, Ireland