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Chang F, Li M, Xu P, Zhou H, Haque MM, Huang H.Chang F, et al. Among authors: xu p.Int J Environ Res Public Health. 2016 Jul 14;13(7):714. doi: 10.3390/ijerph13070714.Int J Environ Res Public Health. 2016.PMID: 27428987Free PMC article.
Guo Q, Xu P, Pei X, Wong SC, Yao D.Guo Q, et al. Among authors: xu p.Accid Anal Prev. 2017 Feb;99(Pt A):114-124. doi: 10.1016/j.aap.2016.11.002. Epub 2016 Nov 25.Accid Anal Prev. 2017.PMID: 27894026
Lee J, Abdel-Aty M, Xu P, Gong Y.Lee J, et al. Among authors: xu p.Accid Anal Prev. 2019 Apr;125:116-123. doi: 10.1016/j.aap.2019.01.037. Epub 2019 Feb 7.Accid Anal Prev. 2019.PMID: 30739046