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Ouyang F, Zhang J, Betrán AP, Yang Z, Souza JP, Merialdi M.Ouyang F, et al.Bull World Health Organ. 2013 May 1;91(5):357-67. doi: 10.2471/BLT.12.111021. Epub 2013 Mar 27.Bull World Health Organ. 2013.PMID: 23678199Free PMC article.
Feng L, Ouyang F, Liu L, Wang X, Wang X, Li YJ, Murtha A, Shen H, Zhang J, Zhang JJ.Feng L, et al. Among authors: ouyang f.J Environ Public Health. 2016;2016:9416054. doi: 10.1155/2016/9416054. Epub 2016 Dec 25.J Environ Public Health. 2016.PMID: 28115951Free PMC article.
Wang X, Ouyang F, Feng L, Wang X, Liu Z, Zhang J.Wang X, et al. Among authors: ouyang f.Environ Health Perspect. 2017 Jun 27;125(6):067017. doi: 10.1289/EHP500.Environ Health Perspect. 2017.PMID: 28669941Free PMC article.