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Chung EK, Han ER, Woo YJ.Chung EK, et al.Korean J Med Educ. 2013 Mar;25(1):39-46. doi: 10.3946/kjme.2013.25.1.39. Epub 2013 Mar 31.Korean J Med Educ. 2013.PMID: 25804652Free PMC article.English.
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Chung EK, Elliott D, Fisher D, May W.Chung EK, et al.South Med J. 2015 Apr;108(4):207-10. doi: 10.14423/SMJ.0000000000000260.South Med J. 2015.PMID: 25871986