Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial by David C. Crowley, Francis C. Lau, Prachi Sharma, Malkanthi Evans, Najla Guthrie, Manashi Bagchi, Debasis Bagchi, Dipak K. Dey, Siba P. Raychaudhuri

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