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. 2016 Jul 15;6:29857. doi: 10.1038/srep29857

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a or b: Statistically significant when compared to the control or the cisplatin group, respectively, P < 0.05 using ANOVA followed by Tukey-Kramer as post-hoc test. EGF: epidermal growth factor; IGF-1: insulin-like growth factor-1; IGF-1R: insulin-like growth factor-1 receptor; CGRP: calcitonin gene-related peptide.