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Review
Mark H Hanna, Andreas M Kaiser 
World J Gastroenterol 27(9):760-781. Published online Mar 7, 2021. doi: 10.3748/wjg.v27.i9.760
Minireviews
Basic Study
Retrospective Cohort Study
Shui-Sheng Zhang, Li Dong, Gao-Ming Wang, Yuan Tian, Xiao-Fang Ye, Yue Zhao, Zheng-Yin Liu, Jia-Yu Zhai, Zhi-Ling Zhao, Jun-Hong Wang, Hui-Min Zhang, Xiao-Long Li, Chang-Xin Wu, Cai-Ting Yang, Li-Juan Yang, Hai-Xia Du, Hui Wang, Qing-Gang Ge, Dian-Rong Xiu, Ning Shen 
World J Gastroenterol 27(9):835-853. Published online Mar 7, 2021. doi: 10.3748/wjg.v27.i9.835
Retrospective Study
Guo-Liang Zheng, Bao Zhang, Yue Wang, Yong Liu, Hai-Tao Zhu, Yan Zhao, Zhi-Chao Zheng 
World J Gastroenterol 27(9):854-865. Published online Mar 7, 2021. doi: 10.3748/wjg.v27.i9.854
Observational Study
Katia Farias e Silva, Hayandra F Nanini, Cynthia Machado Cascabulho, Siane L B Rosas, Patricia T Santana, Antonio José de V Carneiro, Elias Anaissie, Marcio Nucci, Heitor Siffert Pereira de Souza 
World J Gastroenterol 27(9):866-885. Published online Mar 7, 2021. doi: 10.3748/wjg.v27.i9.866
Systematic Reviews
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