The burden of musculoskeletal conditions at the start of the new millennium by Agel, J, Akesson, K, Amadio, P, Anderson, M, Badley, E, Balint, G, Bellamy, N, Bigos, S, Bishop, N, Bivans, B, Bjorke, P, Brooks, P, Browner, B, Buckwalter, J, Callahan, L, Chahade, W, Chopra, A, Cimmino, M, Cooper, C, Darmawan, J, De Mesquita, K, De Smedt, M, Delmas, P, Dequeker, J, Dieppe, P