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This version may be downloaded for personal use only. Permission to reproduce this article must be sought from the Taylor and Francis Group. This is the accepted manuscript of an article published by the Taylor and Francis Group in Disability and Rehabilitation, 38(7): 620-626, 2016, available online: http://tandfonline.com/doi/full/10.3109/09638288.2015.1055376 (Please note: access via this link may only be available with a subscription)