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Minireviews
Ming-Cheng Guan, Wei Ouyang, Ming-Da Wang, Lei Liang, Na Li, Ting-Ting Fu, Feng Shen, Wan-Yee Lau, Qiu-Ran Xu, Dong-Sheng Huang, Hong Zhu, Tian Yang 
World J Gastrointest Oncol 13(5):351-365. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.351
Retrospective Study
Observational Study
Mohammad Elsayed, Mohammad Loya, James Galt, David M Schuster, Zachary L Bercu, Janice Newsome, David Brandon, Sonia Benenati, Keywan Behbahani, Richard Duszak, Ila Sethi, Nima Kokabi 
World J Gastrointest Oncol 13(5):440-452. Published online May 15, 2021. doi: 10.4251/wjgo.v13.i5.440
Systematic Reviews