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Swelling ratio of PF hydrogels (PF-0, PF-0.5, PF-1.5, and PF-2.5) cross-linked with 0, 0.5, 1.5, and 2.5% of PEG-DA, respectively. Mean ± SD: n = 3/group. Analysis revealed significant effects of cross-linking by the addition of PEG-DA on the swelling ratio (* P < 0.05).
