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Óscar Dario Gómez Beltrán, Amparo Valverde Martínez, María del Carmen Pérez Manrique, Joaquín Sánchez Rodríguez, Enrique Lizárraga Febres, Sebastián Rufián Peña 
World J Gastrointest Surg 3(12):197-200. Published online Dec 27, 2011. doi: 10.4240/wjgs.v3.i12.197
Satoshi Furuhashi, Hiroshi Takamori, Shinnya Abe, Osamu Nakahara, Hiroshi Tanaka, Kei Horino, Toru Beppu, Ken-ichi Iyama, Hideo Baba 
World J Gastrointest Surg 3(12):201-203. Published online Dec 27, 2011. doi: 10.4240/wjgs.v3.i12.201