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Open-Access Journal
Frontier
Review
Minireviews
Basic Study
Josieli R Colares, Renata M Hartmann, Elizângela G Schemitt, Sandielly R B Fonseca, Marilda S Brasil, Jaqueline N Picada, Alexandre S Dias, Aline F Bueno, Cláudio A Marroni, Norma P Marroni 
World J Gastroenterol 28(3):348-364. Published online Jan 21, 2022. doi: 10.3748/wjg.v28.i3.348
Case Control Study
Retrospective Cohort Study
Letter to the Editor
Tommaso Maria Manzia, Alessandro Parente, Roberta Angelico 
World J Gastroenterol 28(3):399-401. Published online Jan 21, 2022. doi: 10.3748/wjg.v28.i3.399