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Open-Access Journal
Frontier
Opinion Review
Evidence Review
Review
Paul T Kröner, Megan ML Engels, Benjamin S Glicksberg, Kipp W Johnson, Obaie Mzaik, Jeanin E van Hooft, Michael B Wallace, Hashem B El-Serag, Chayakrit Krittanawong 
World J Gastroenterol 27(40):6794-6824. Published online Oct 28, 2021. doi: 10.3748/wjg.v27.i40.6794
Minireviews
Basic Study
Retrospective Cohort Study
Observational Study
Hend Ibrahim Shousha, Shimaa Afify, Rabab Maher, Noha Asem, Eman Fouad, Ehab F Mostafa, Mohammed A Medhat, Amr Abdalazeem, Hazem Elmorsy, Miriam M Aziz, Rateba S Mohammed, Mohamed Ibrahem, Hassan Elgarem, Dalia Omran, Mohamed Hassany, Bassem Elsayed, Ahmed Y Abdelaziz, Mohamed El Kassas 
World J Gastroenterol 27(40):6951-6966. Published online Oct 28, 2021. doi: 10.3748/wjg.v27.i40.6951
Meta-Analysis
Eszter Boros, Zoltán Sipos, Péter Hegyi, Brigitta Teutsch, Levente Frim, Szilárd Váncsa, Szabolcs Kiss, Fanni Dembrovszky, Eduard Oštarijaš, Andrew Shawyer, Bálint Erőss 
World J Gastroenterol 27(40):6985-6999. Published online Oct 28, 2021. doi: 10.3748/wjg.v27.i40.6985
Letter to the Editor