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Opinion Review
Minireview
Basic Study
Case Control Study
Livia Petrusel, Ioana Rusu, Daniel Corneliu Leucuta, Radu Seicean, Ramona Suharoschi, Paula Zamfir, Andrada Seicean 
World J Gastrointest Oncol 11(12):1126-1140. Published online Dec 15, 2019. doi: 10.4251/wjgo.v11.i12.1126
Retrospective Study
Marcus Fernando Kodama Pertille Ramos, Leandro Cardoso Barchi, Rodrigo Jose de Oliveira, Marina Alessandra Pereira, Donato Roberto Mucerino, Ulysses Ribeiro Jr, Bruno Zilberstein, Ivan Cecconello 
World J Gastrointest Oncol 11(12):1161-1171. Published online Dec 15, 2019. doi: 10.4251/wjgo.v11.i12.1161
Ya Zeng, Wen Yu, Qi Liu, Wei-Wei Yu, Zheng-Fei Zhu, Wei-Xin Zhao, Jun Liu, Jia-Ming Wang, Xiao-Long Fu, Yuan Liu, Xu-Wei Cai 
World J Gastrointest Oncol 11(12):1172-1181. Published online Dec 15, 2019. doi: 10.4251/wjgo.v11.i12.1172
Observational Study
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Case Report