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Open-Access Journal
Editorial
Review
Nancy Vargas-Mendoza, Jazmín García-Machorro, Marcelo Angeles-Valencia, Marlet Martínez-Archundia, Eduardo Osiris Madrigal-Santillán, Ángel Morales-González, Liliana Anguiano-Robledo, José A Morales-González 
World J Gastroenterol 27(34):5630-5665. Published online Sep 14, 2021. doi: 10.3748/wjg.v27.i34.5630
Minireviews
Wei Liu, Xue Liu, Mei Peng, Gong-Quan Chen, Peng-Hua Liu, Xin-Wu Cui, Fan Jiang, Christoph F Dietrich 
World J Gastroenterol 27(34):5715-5726. Published online Sep 14, 2021. doi: 10.3748/wjg.v27.i34.5715
Retrospective Cohort Study
Chia-Cheng Lee, Yu-Cheng Kuo, Je-Ming Hu, Pi-Kai Chang, Chien-An Sun, Tsan Yang, Chuan-Wang Li, Chao-Yang Chen, Fu-Huang Lin, Chih-Hsiung Hsu, Yu-Ching Chou 
World J Gastroenterol 27(34):5737-5752. Published online Sep 14, 2021. doi: 10.3748/wjg.v27.i34.5737
Retrospective Study
Observational Study
Meta-Analysis
Qurat Ul Ain, Yasir Bashir, Linda Kelleher, David M Bourne, Suzanne M Egan, Jean McMahon, Laura Keaskin, Oonagh M Griffin, Kevin C Conlon, Sinead N Duggan 
World J Gastroenterol 27(34):5775-5792. Published online Sep 14, 2021. doi: 10.3748/wjg.v27.i34.5775
Letter to the Editor
Anna Di Sessa, Stefano Guarino, Rosa Melone, Rossella Francesca De Simone, Pierluigi Marzuillo, Emanuele Miraglia del Giudice 
World J Gastroenterol 27(34):5793-5795. Published online Sep 14, 2021. doi: 10.3748/wjg.v27.i34.5793