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Oentarini Tjandra, Pertama and Shirly Gunawan, Kedua and Johan, Ketiga and Fia Fia Lie, Keempat Efficacy and Safety of Undenaturated Type II Collagen in The Treatment of Osteoarthritis of The Knee: A Randomized, Double-blind, Placebo-controlled Trial. Efficacy and Safety of Undenaturated Type II Collagen in The Treatment of Osteoarthritis of The Knee: A Randomized, Double-blind, Placebo-controlled Trial..