1. Department of Neurology, Mayo Clinic, 4500 San Pablo Rd, Jacksonville, FL 32224*
2. Division of Neurological and Psychiatric Nursing, Faculty of Health Sciences, Medical University of Gdansk, Gdansk, Poland†
3. Neurology Department, St Adalbert Hospital, Copernicus PL Ltd, Jana Pawla II 50, 80-462, Gdansk, Poland‡