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Nicolas C Buchs, Neil J Mortensen, Frederic Ris, Philippe Morel, Pascal Gervaz 
World J Gastrointest Surg 7(11):313-318. Published online Nov 27, 2015. doi: 10.4240/wjgs.v7.i11.313
José M Beleña, Ernesto Josué Ochoa, Mónica Núñez, Carlos Gilsanz, Alfonso Vidal 
World J Gastrointest Surg 7(11):319-325. Published online Nov 27, 2015. doi: 10.4240/wjgs.v7.i11.319
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