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Kahan, A; Uebelhart, D; De Vathaire, F; Delmas, P D; Reginster, J Y (2009). Long-term effects of chondroitins 4 and 6 sulfate on knee osteoarthritis: the study on osteoarthritis progression prevention, a two-year, randomized, double-blind, placebo-controlled trial. Arthritis and Rheumatism, 60(2):524-533.