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Fan L, Lukin W, Zhao J, Sun J, Hou XY.Fan L, et al.Emerg Med J. 2015 Sep;32(9):738-43. doi: 10.1136/emermed-2014-203770. Epub 2014 Dec 19.Emerg Med J. 2015.PMID: 25527472Review.
Alumran A, Hou XY, Sun J, Yousef AA, Hurst C.Alumran A, et al.BMC Public Health. 2014 Jan 23;14:73. doi: 10.1186/1471-2458-14-73.BMC Public Health. 2014.PMID: 24456730Free PMC article.