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Tennyson CA, Lewis BS.Tennyson CA, et al. Among authors: lewis bs.Gastrointest Endosc Clin N Am. 2009 Jul;19(3):315-24. doi: 10.1016/j.giec.2009.04.005.Gastrointest Endosc Clin N Am. 2009.PMID: 19647641Review.
Lewis B.Lewis B.Gastrointest Endosc Clin N Am. 2006 Apr;16(2):221-8, vii. doi: 10.1016/j.giec.2006.01.015.Gastrointest Endosc Clin N Am. 2006.PMID: 16644452Review.