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Firpi RJ, Soldevila-Pico C, Morelli GG, Cabrera R, Levy C, Clark VC, Suman A, Michaels A, Chen C, Nelson DR.Firpi RJ, et al. Among authors: clark vc.Dig Dis Sci. 2010 Jan;55(1):196-203. doi: 10.1007/s10620-009-0981-3.Dig Dis Sci. 2010.PMID: 19798576Clinical Trial.