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Effect of an oral preparation containing hyaluronic acid, chondroitin sulfate, hydrolyzed collagen type II and hydrolyzed keratin on synovial fluid features and clinical indices in knee osteoarthritis. A pilot study. Reumatismo [Internet]. 2020 Nov. 19 [cited 2025 Jun. 18];72(3):125-30. Available from: https://www.reumatismo.org/reuma/article/view/1272