1. Department of Neurology and Neurosurgery, University of Tartu, Tartu, Estonia
2. II Department of Internal Diseases, Pärnu Hospital, Pärnu, Estonia
3. Neurology Clinic, West-Tallinn Central Hospital, Tallinn, Estonia
4. Centre of Neurology, East-Tallinn Central Hospital, Tallinn, Estonia
5. Neurology Centre, North Estonia Medical Centre, Tallinn, Estonia
6. Department of Neurology, Tartu University Hospital, Tartu, Estonia