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Feld KA, Feld AD.Feld KA, et al. Among authors: feld ad.Gastrointest Endosc Clin N Am. 2010 Oct;20(4):593-601. doi: 10.1016/j.giec.2010.07.002.Gastrointest Endosc Clin N Am. 2010.PMID: 20889065Review.