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Oentarini Tjandra, Pertama and Shirly Gunawan, Kedua and Johan, Ketiga and Fia Fia Lie, Kempat and Marcella Erwina Rumawas, Kelima and Agus Limarta, Keenam Efficacy and Safety of Undenatured Type II Collagen in The Treatment of Osteoarthritis of The Knee: A Randomized, Double-blind, Placebo-controlled Trial. Efficacy and Safety of Undenatured Type II Collagen in The Treatment of Osteoarthritis of The Knee: A Randomized, Double-blind, Placebo-controlled Trial.