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Open-Access Journal
Opinion Review
Ze-Ming Chen, Min-Si Peng, Li-Sheng Wang, Zheng-Lei Xu 
World J Gastrointest Oncol 13(6):462-471. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.462
Review
Muhammad Shehroz Zeeshan, Zeeshan Ramzan 
World J Gastrointest Oncol 13(6):472-494. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.472
Minireviews
Peng Gao, Xin Huang, Xue-Yan Fang, Hui Zheng, Shu-Ling Cai, Ai-Jun Sun, Liang Zhao, Yong Zhang 
World J Gastrointest Oncol 13(6):536-549. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.536
Zhi Zheng, Jie Yin, Xiao-Ye Liu, Xiao-Sheng Yan, Rui Xu, Meng-Yi Li, Jun Cai, Guang-Yong Chen, Jun Zhang, Zhong-Tao Zhang 
World J Gastrointest Oncol 13(6):560-573. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.560
Retrospective Study
Flávio Silano, Ricardo Bandeira de Melo Amaral, Rodolfo Carvalho Santana, Vanessa Costa Neves, José Celso Ardengh, Paulo Cezar Galvão do Amaral 
World J Gastrointest Oncol 13(6):589-599. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.589
Observational Study
Ahmed Alzamzamy, Huda Elsayed, Mona Abd Elraouf, Hanan Eltoukhy, Tarek Megahed, Ashraf Aboubakr 
World J Gastrointest Oncol 13(6):600-611. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.600
Prospective Study
Benjamin Babic, Dolores T Müller, Florian Gebauer, Lars Mortimer Schiffmann, Rabi R Datta, Wolfgang Schröder, Christiane J Bruns, Jessica M Leers, Hans F Fuchs 
World J Gastrointest Oncol 13(6):612-624. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.612
Systematic Reviews
Alessandro Fancellu, Valeria Sanna, Giulia Deiana, Chiara Ninniri, Davide Turilli, Teresa Perra, Alberto Porcu 
World J Gastrointest Oncol 13(6):625-637. Published online Jun 15, 2021. doi: 10.4251/wjgo.v13.i6.625
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