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Open-Access Journal
Review
Henu Kumar Verma, Lakkakula Venkata Kameswara Subrahmanya Bhaskar, Naveen Kumar Vishvakarma, Akriti Jaiswal, Yashwant Kumar Ratre, Arundhati Mehta, Tarun Sahu 
World J Gastroenterol 27(6):449-469. Published online Feb 14, 2021. doi: 10.3748/wjg.v27.i6.449
Basic Study
Feng Gu, Tao Zhang, Kai Li, Bin Hou, Wen-Yan Zhao, Ming Sun, Peng Deng 
World J Gastroenterol 27(6):487-500. Published online Feb 14, 2021. doi: 10.3748/wjg.v27.i6.487
Retrospective Cohort Study
Li-Qi Sun, Li-Si Peng, Jie-Fang Guo, Fei Jiang, Fang Cui, Hao-Jie Huang, Zhen-Dong Jin 
World J Gastroenterol 27(6):501-512. Published online Feb 14, 2021. doi: 10.3748/wjg.v27.i6.501
Retrospective Study
Ya-Mei Zheng, Xian-Yun Chen, Jie-Yi Cai, Yu Yuan, Li-Hao Wu, Xing-Xiang He, Min Zhang, Harry Hua-Xiang Xia, Jia-Ting Xu, Wen-Rui Xie 
World J Gastroenterol 27(6):513-522. Published online Feb 14, 2021. doi: 10.3748/wjg.v27.i6.513
Prospective Study
Jasbir Makker, Hassan Tariq, Kishore Kumar, Madhavi Ravi, Danial Haris Shaikh, Vivien Leung, Umar Hayat, Muhammad T Hassan, Harish Patel, Suresh Nayudu, Sridhar Chilimuri 
World J Gastroenterol 27(6):523-533. Published online Feb 14, 2021. doi: 10.3748/wjg.v27.i6.523
Case Report
Masahiro Yura, Kiminori Takano, Kiyohiko Adachi, Asuka Hara, Keita Hayashi, Yuki Tajima, Yasushi Kaneko, Yoichiro Ikoma, Hiroto Fujisaki, Akira Hirata, Kumiko Hongo, Kikuo Yo, Kimiyasu Yoneyama, Reiko Dehari, Kazuo Koyanagi, Motohito Nakagawa 
World J Gastroenterol 27(6):534-544. Published online Feb 14, 2021. doi: 10.3748/wjg.v27.i6.534
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