1 Neurological and Psychiatric Nursing Department, Faculty of Health Sciences, Medical University of Gdansk, ul. Sklodowskiej-Curie 3a, Gdansk, Poland; Neurology Department, St. Adalbert Hospital, Copernicus PL, Al. Jana Pawla II 50, Gdansk, Poland; ENROLL-HD Study Site, St. Adalbert Hospital, Copernicus PL, Gdansk, Poland. Electronic address: emilia.sitek@gumed.edu.pl.