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Chen CH, Liu HC, Hung TT, Liu TP.Chen CH, et al. Among authors: liu hc, liu tp.J Cardiothorac Surg. 2009 Jul 9;4:31. doi: 10.1186/1749-8090-4-31.J Cardiothorac Surg. 2009.PMID: 19589162Free PMC article.