OARSI recommendations for the management of hip and knee osteoarthritis, part I: critical appraisal of existing treatment guidelines and systematic review of current research evidence. - Zhang, W; Moskowitz, R; Nuki, G; Abramson, S; Altman, R; Arden, N; Bierma-Zeinstra, S; Brandt, K; Croft, P; Doherty, M; Dougados, M; Hochberg, M; et al. (Osteoarthritis and cartilage / OARS, Osteoarthritis Research Society, 2007)