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Retrospective Cohort Study
Retrospective Study
Anastasios Ntavatzikos, Aris Spathis, Paul Patapis, Nikolaos Machairas, Georgia Vourli, George Peros, Iordanis Papadopoulos, Ioannis Panayiotides, Anna Koumarianou 
World J Gastrointest Oncol 11(7):551-566. Published online Jul 15, 2019. doi: 10.4251/wjgo.v11.i7.551