Effects of actual and imagined music-cued gait training on motor functioning and brain activity in people with multiple sclerosis: protocol of a randomised parallel multicentre trial. - Seebacher B; Helmlinger B; Pinter D; Ehling R; Hegen H; Ropele S; Reishofer G; Enzinger C; Brenneis C; Deisenhammer F (BMJ open, 2022)