Motl RW, Backus D, Neal WN, Cutter G, Palmer L, McBurney R, Schmidt H, Bethoux F, Hebert J, Ng A, McCully KK, Plummer P. Rationale and design of the STEP for MS Trial: Comparative effectiveness of Supervised versus Telerehabilitation Exercise Programs for Multiple Sclerosis. Contemp Clin Trials. 2019 06; 81:110-122.