Kahan A,Uebelhart D,De VF,Delmas PD,Reginster JY. 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 Rheum 2009;60(2):524-533.

PubMed ID: 19180484