title: Corrigendum.
abstract: Corrigendum to What does a structured review of the effectiveness of exercise interventions for persons with multiple sclerosis tell us about the challenges of designing trials by M Asano, DJ Dawes, A Arafah, C Moriello and NE Mayo, Multiple Sclerosis, Clinical and Laboratory Research, 2009; Volume 15, No.4, pp 412-421 [DOI: 10.1177/1352458508101877].