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Open-Access Journal
Frontier
Satya Priya Sharma, Ki Tae Suk, Dong Joon Kim 
World J Gastroenterol 27(37):6161-6179. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6161
Opinion Review
Paolo Del Poggio, Marzio Mazzoleni, Sergio Lazzaroni, Andrea D'Alessio 
World J Gastroenterol 27(37):6180-6190. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6180
Review
Chrysanthos D Christou, Georgios Tsoulfas 
World J Gastroenterol 27(37):6191-6223. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6191
Minireviews
Chikara Iino, Tadashi Shimoyama 
World J Gastroenterol 27(37):6224-6230. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6224
Farah Albader, Petra Anna Golovics, Lorant Gonczi, Talat Bessissow, Waqqas Afif, Peter Laszlo Lakatos 
World J Gastroenterol 27(37):6231-6247. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6231
Basic Study
Jing-Jing Nie, Ya-Ya Pian, Ji-Hong Hu, Guo-Qing Fan, Lv-Tao Zeng, Qiu-Geng Ouyang, Zhen-Xiang Gao, Zhen Liu, Chen-Chen Wang, Qian Liu, Jian-Ping Cai 
World J Gastroenterol 27(37):6248-6261. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6248
Retrospective Cohort Study
Ai-Ru Hsieh, Cathy S J Fann, Hung-Chun Lin, Jennifer Tai, Sen-Yung Hsieh, Dar-In Tai 
World J Gastroenterol 27(37):6262-6276. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6262
Retrospective Study
Miao-Hui Huang, Hsin-Yun Sun, Shu-Yuan Ho, Sui-Yuan Chang, Szu-Min Hsieh, Wang-Huei Sheng, Yu-Chung Chuang, Yu-Shan Huang, Li-Hsin Su, Wen-Chun Liu, Yi-Ching Su, Chien-Ching Hung 
World J Gastroenterol 27(37):6277-6289. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6277
Observational Study
Systematic Reviews
Case Report
Daniel Keese, Andrea Schmedding, Kerstin Saalabian, Georgy Lakshin, Henning Fiegel, Udo Rolle 
World J Gastroenterol 27(37):6332-6344. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6332
Letter to the Editor
Igor Braga Ribeiro, Diogo Turiani Hourneaux de Moura, Eduardo Guimarães Hourneaux de Moura 
World J Gastroenterol 27(37):6345-6347. Published online Oct 7, 2021. doi: 10.3748/wjg.v27.i37.6345
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