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Marina Ulla, Ernestina Gentile, Ezequiel Levy Yeyati, Maria L Diez, Demetrio Cavadas, Ricardo D Garcia-Monaco, Pablo R Ros 
World J Gastrointest Oncol 5(12):222-229. Published online Dec 15, 2013. doi: 10.4251/wjgo.v5.i12.222
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