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Simone Ferrero, Giovanni Camerini, Umberto Leone Roberti Maggiore, Pier L Venturini, Ennio Biscaldi, Valentino Remorgida 
World J Gastrointest Surg 3(3):31-38. Published online Mar 27, 2011. doi: 10.4240/wjgs.v3.i3.31
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