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Ahmed M, Huang H, Abdel-Aty M, Guevara B.Ahmed M, et al. Among authors: huang h.Accid Anal Prev. 2011 Jul;43(4):1581-9. doi: 10.1016/j.aap.2011.03.021. Epub 2011 Apr 13.Accid Anal Prev. 2011.PMID: 21545893
Zeng Q, Huang H.Zeng Q, et al. Among authors: huang h.Accid Anal Prev. 2014 Jun;67:105-12. doi: 10.1016/j.aap.2014.02.018. Epub 2014 Mar 2.Accid Anal Prev. 2014.PMID: 24636872