Contribution of the COMT Val158Met variant to symptomatic knee osteoarthritis. Issue 1 (13th July 2013) - Neogi, T; Soni, A; Doherty, S A; Laslett, L L; Maciewicz, R A; Hart, D J; Zhang, W; Muir, K R; Wheeler, M; Cooper, C; Spector, T D; Cicuttini, F; et al.