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Open-Access Journal
Editorial
Frontier
Akane Hara, Tomohiro Watanabe, Kosuke Minaga, Tomoe Yoshikawa, Ken Kamata, Masatoshi Kudo 
World J Gastroenterol 27(19):2257-2269. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2257
Review
Armando Rojas, Iván Schneider, Cristian Lindner, Ileana Gonzàlez, Miguel Angel Morales 
World J Gastroenterol 27(19):2270-2280. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2270
Lukas Hartl, Joshua Elias, Gerhard Prager, Thomas Reiberger, Lukas W Unger 
World J Gastroenterol 27(19):2281-2298. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2281
Minireviews
Paul Calame, Gaëlle Tyrode, Delphine Weil Verhoeven, Sophie Félix, Anne Julia Klompenhouwer, Vincent Di Martino, Eric Delabrousse, Thierry Thévenot 
World J Gastroenterol 27(19):2299-2311. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2299
Byungchang Jin, Rajan Singh, Se Eun Ha, Hannah Zogg, Paul J Park, Seungil Ro 
World J Gastroenterol 27(19):2341-2352. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2341
Retrospective Cohort Study
Jiyoung Yoon, Dae Sung Kim, Ye-Jee Kim, Jin Wook Lee, Seung Wook Hong, Ha Won Hwang, Sung Wook Hwang, Sang Hyoung Park, Dong-Hoon Yang, Byong Duk Ye, Jeong-Sik Byeon, Seung-Jae Myung, Suk-Kyun Yang 
World J Gastroenterol 27(19):2353-2365. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2353
Retrospective Study
Lan-Qing Liang, Ling-Ling Meng, Bo-Ning Cai, Ze-Ping Cui, Na Ma, Le-Hui Du, Wei Yu, Bao-Lin Qu, Sheng-Qiang Feng, Fang Liu 
World J Gastroenterol 27(19):2366-2375. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2366
Observational Study
Xiao-Juan Yang, Dan Liu, Hong-Yan Ren, Xiao-Ya Zhang, Jun Zhang, Xiao-Jun Yang 
World J Gastroenterol 27(19):2376-2393. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2376
Xia Liu, Yi-Wen Cheng, Li Shao, Shu-Hong Sun, Jian Wu, Qing-Hai Song, Hong-Sheng Zou, Zong-Xin Ling 
World J Gastroenterol 27(19):2394-2414. Published online May 21, 2021. doi: 10.3748/wjg.v27.i19.2394
Meta-Analysis
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