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The above article, published in Wiley Online Library (wileyonlinelibrary.com) on 30 March 2015, has been retracted by agreement of the authors; the journal Editor-in-Chief, Fadlo R. Khuri; Wiley Periodicals, Inc.; and the American Cancer Society. After this article was published, the authors discovered that, unbeknownst to them, the sampling had been compromised, resulting in duplicate samples involving 93 controls and 4 cases. This led to a change in sample size, statistical power, and some of the results. The authors notified the Editor-in-Chief and respectfully requested that the article be retracted.