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Thongchai, K.; Chuysinuan, P.; Thanyacharoen, T.; Techasakul, S.; Ummartyotin, S. Characterization, Release, and Antioxidant Activity of Caffeic Acid-Loaded Collagen and Chitosan Hydrogel Composites. J. Mater. Res. 2020, 9, 6512-6520.