Chondroitins 4 and 6 sulfate in osteoarthritis of the knee: A randomized, controlled trial

Michel BA, Stucki G, Frey D, De Vathaire F, Vignon E, Bruehlmann P, Uebelhart D.
Chondroitins 4 and 6 sulfate in osteoarthritis of the knee: A randomized, controlled trial.
Arthritis Rheum. 2005 Mar;52(3):779-86.