Assessment of osteoarthritis candidate genes in a meta-analysis of nine genome-wide association studies. by Rodriguez-Fontenla, C, Calaza, M, Evangelou, E, Valdes, A, Arden, N, Blanco, F, Carr, A, Chapman, K, Deloukas, P, Doherty, M, Esko, T, Garcés Aletá, C, Gomez-Reino Carnota, J, Helgadottir, H, Hofman, A, Jonsdottir, I, Kerkhof, H, Kloppenburg, M, McCaskie, A, Ntzani, E, Ollier, W, Oreiro, N, Panoutsopoulou, K, Ralston, S, Ramos, Y