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Cohen ME, Bilimoria KY, Ko CY, Hall BL.Cohen ME, et al. Among authors: ko cy.J Am Coll Surg. 2009 Jun;208(6):1009-16. doi: 10.1016/j.jamcollsurg.2009.01.043. Epub 2009 Apr 17.J Am Coll Surg. 2009.PMID: 19476884