Development and testing of a computerized animated activity questionnaire (AAQ) for assessing activity limitations in patients with hip and knee osteoarthritis. (April 2015) - Peter, W.F.; Loos, M.; de Vet, R.C.; Boers, M.; Harlaar, J.; Roorda, L.D.; Poolman, R.W.; Scholtes, V.A.; Boogaard, J.; Buitelaar, H.; Steultjens, M.; Roos, E.M.; et al.