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Georgios Tsoulfas, Manousos Georgios Pramateftakis, Ioannis Kanellos 
World J Gastrointest Oncol 3(1):1-9. Published online Jan 15, 2011. doi: 10.4251/wjgo.v3.i1.1
Goran Z Stanojevic, Milica D Nestorovic, Branko R Brankovic, Miroslav P Stojanovic, Milan M Jovanovic, Milan D Radojkovic 
World J Gastrointest Oncol 3(1):14-18. Published online Jan 15, 2011. doi: 10.4251/wjgo.v3.i1.14