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Kwon HM, Hong BK, Jang GJ, Kim DS, Choi EY, Kim IJ, McKenna CJ, Ritman EL, Schwartz RS.Kwon HM, et al. Among authors: mckenna cj.J Korean Med Sci. 1999 Oct;14(5):502-10. doi: 10.3346/jkms.1999.14.5.502.J Korean Med Sci. 1999.PMID: 10576145Free PMC article.