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Open-Access Journal
Therapeutic and Diagnostic Guidelines
Review
Amedeo Amedei, Stefano Gitto, Olja Stevanovic, Aleksandra Barac, Ankica Vujovic, Edda Russo, Ivana Milosevic 
World J Gastroenterol 27(33):5488-5501. Published online Sep 7, 2021. doi: 10.3748/wjg.v27.i33.5488
Alejandro Campos-Murguía, Berenice M Román-Calleja, José A González-Regueiro, Ivonne Hurtado-Díaz-de-León, Alberto Adrián Solís-Ortega, Nayelli C Flores-García, Ignacio García-Juárez, Astrid Ruiz-Margáin, Ricardo Ulises Macías-Rodríguez 
World J Gastroenterol 27(33):5502-5519. Published online Sep 7, 2021. doi: 10.3748/wjg.v27.i33.5502
Minireviews
Chiara Viganò, Giacomo Mulinacci, Andrea Palermo, Donatella Barisani, Lorena Pirola, Maria Fichera, Pietro Invernizzi, Sara Massironi 
World J Gastroenterol 27(33):5520-5535. Published online Sep 7, 2021. doi: 10.3748/wjg.v27.i33.5520
Basic Study
Retrospective Study
Letter to the Editor