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² Di, L., Mannelli, C., Maresca, M., Micheli, L., Martinez-puig, D., & Ghelardini, C. (n.d.). LOW DOSE CHICKEN NATIVE TYPE II COLLAGEN Inflammatory infiltrate. Florence, Italy.

³ Scarpellini, M., Lurati, A., Vignati, G., Marrazza, M. G., Telese, F., Re, K., & Bellistri, A. (2008). Biomarkers, type II collagen, glucosamine and chondroitin sulfate in OA follow-up: The "Magenta OA study." Journal of Orthopaedics and Traumatology, 9(2), 81–87.

⁴ Douglas S Kalman, Maria Heimer, Anita Valdeon, Howard Schwartz and Eric Sheldon. Effect of a natural extract of chicken combs with a high content of hyaluronic acid on pain relief and quality of life in subjects with knee OA: a pilot randomized double-blind placebo-controlled trial. Nutrition Journal 2008;7(3):1-9.

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⁷ Sánchez J, Bonet ML, Keijer J, van Schothorst EM, Mölller I, Chetrit C, Martinez-Puig D, Palou A. Blood cells transcriptomics as source of potential biomarkers of articular health improvement: effects of oral intake of a rooster combs extract rich in hyaluronic acid. Genes & Nutrition 2014; 9: 417.

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⁹ Int J Med Sci. 2010 Nov 1;7(6):366-77, Comparative Efficacy and Tolerability of 5-Loxin and Aflapin Against OA of the Knee: A Double Blind, Randomized, Placebo Controlled Clinical Study.

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¹¹ Int J Med Sci. 2011 Oct 12;8(7):615-622, A Double Blind, Randomized, Placebo Controlled Clinical Study Evaluates the Early Efficacy of Aflapin^® in Subjects with OA of Knee.