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Harrell LE, Hanauer SB.Harrell LE, et al. Among authors: hanauer sb.Gastroenterol Clin North Am. 2004 Jun;33(2):303-17, ix-x. doi: 10.1016/j.gtc.2004.02.010.Gastroenterol Clin North Am. 2004.PMID: 15177540Review.