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Jacobo Ortiz-Fernández-Sordo, Adolfo Parra-Blanco, Alejandro García-Varona, María Rodríguez-Peláez, Erika Madrigal-Hoyos, Irving Waxman, Luis Rodrigo 
World J Gastrointest Endosc 3(9):171-182. Published online Sep 16, 2011. doi: 10.4253/wjge.v3.i9.171