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Original Article
Jose Geraldo P Ferraz, Fernando AB Suassuna, José Murilo R Zeitune, Licio A Velloso, Gerson JN Ferraz, Paula RS Câmara 
World J Gastrointest Pathophysiol 3(4):85-91. Published online Aug 15, 2012. doi: 10.4291/wjgp.v3.i4.85