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Zhang YZ, Sun WC, Wang ZH, Zhang ZF.Zhang YZ, et al.Iran J Public Health. 2014 Jan;43(1):120-2.Iran J Public Health. 2014.PMID: 26060689Free PMC article.
Zhang D, Sun W, Li D, Zhang Z.Zhang D, et al. Among authors: zhang z.Transl Cancer Res. 2020 Mar;9(3):2037-2039. doi: 10.21037/tcr.2019.12.24.Transl Cancer Res. 2020.PMID: 35117550Free PMC article.