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Yang GG, Yang MC, Chung CY, Chen YT, Chang ET.Yang GG, et al. Among authors: chang et.J Formos Med Assoc. 2011 Oct;110(10):642-5. doi: 10.1016/j.jfma.2011.08.006. Epub 2011 Sep 15.J Formos Med Assoc. 2011.PMID: 21982468Free article.
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