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Open-Access Journal
Frontier
Opinion Review
Alberto Tringali, Deborah Costa, Alessandro Fugazza, Matteo Colombo, Kareem Khalaf, Alessandro Repici, Andrea Anderloni 
World J Gastroenterol 27(44):7597-7611. Published online Nov 28, 2021. doi: 10.3748/wjg.v27.i44.7597
Evidence Review
Review
Minireviews
Basic Study
Observational Study
Systematic Reviews
Letter to the Editor
Ricardo Wesley Alberca, Gil Benard, Gabriela Gama Freire Alberca, Maria Notomi Sato 
World J Gastroenterol 27(44):7734-7738. Published online Nov 28, 2021. doi: 10.3748/wjg.v27.i44.7734