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Open-Access Journal
Opinion Review
Review
Rachel Elizabeth Ann Fincham, Francesca Romana Delvecchio, Michelle R Goulart, Joe Poe Sheng Yeong, Hemant M Kocher 
World J Gastroenterol 27(24):3483-3501. Published online Jun 28, 2021. doi: 10.3748/wjg.v27.i24.3483
Ting-Ting Cao, Gu-Qin Zhang, Emily Pellegrini, Qiu Zhao, Jin Li, Lin-jie Luo, Hua-Qin Pan 
World J Gastroenterol 27(24):3502-3515. Published online Jun 28, 2021. doi: 10.3748/wjg.v27.i24.3502
Minireviews
Ângelo Zambam de Mattos, Jose D Debes, Andre Boonstra, Ju-Dong Yang, Domingo C Balderramo, Giovana D P Sartori, Angelo Alves de Mattos 
World J Gastroenterol 27(24):3556-3567. Published online Jun 28, 2021. doi: 10.3748/wjg.v27.i24.3556
Basic Study
Xiao-Hua Li, Yong-Yi Huang, Lin-Ming Lu, Li-Juan Zhao, Xian-Ke Luo, Ru-Jia Li, Yuan-Yuan Dai, Chun Qin, Yan-Qiang Huang, Hao Chen 
World J Gastroenterol 27(24):3595-3608. Published online Jun 28, 2021. doi: 10.3748/wjg.v27.i24.3595
Case Control Study
Retrospective Study
Ulrike Bauer, Sabine Gerum, Falk Roeder, Stefan Münch, Stephanie E Combs, Alexander B Philipp, Enrico N De Toni, Martha M Kirstein, Arndt Vogel, Carolin Mogler, Bernhard Haller, Jens Neumann, Rickmer F Braren, Marcus R Makowski, Philipp Paprottka, Markus Guba, Fabian Geisler, Roland M Schmid, Andreas Umgelter, Ursula Ehmer 
World J Gastroenterol 27(24):3630-3642. Published online Jun 28, 2021. doi: 10.3748/wjg.v27.i24.3630
Observational Study
Systematic Reviews
Mihaela Fadgyas Stanculete, Giuseppe Chiarioni, Dan Lucian Dumitrascu, Dinu Iuliu Dumitrascu, Stefan-Lucian Popa 
World J Gastroenterol 27(24):3668-3681. Published online Jun 28, 2021. doi: 10.3748/wjg.v27.i24.3668