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Fernando de la Portilla, Arantxa Calero-Lillo, Rosa M Jiménez-Rodríguez, Maria L Reyes, Manuela Segovia-González, María Victoria Maestre, Ana M García-Cabrera 
World Journal of Gastrointestinal Surgery 7(9):203-207. Published online Sep 27, 2015. doi: 10.4240/wjgs.v7.i9.203
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