A. De Wolf, R. Tate, N. . A. Lannin, J. W. Middleton, A. Lane-Brown, and I. D. Cameron, “The World Health Organization Disability Assessment Scale, WHODAS II: Reliability and validity in the measurement of activity and participation in a spinal cord injury population”, JRM, vol. 44, no. 9, pp. 747–755, Jul. 2012.