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Frontier
Opinion Review
Review
Kapil Gupta, Abhishek Bhurwal, Cindy Law, Scott Ventre, Carlos D Minacapelli, Savan Kabaria, You Li, Christopher Tait, Carolyn Catalano, Vinod K Rustgi 
World J Gastroenterol 27(26):3984-4003. Published online Jul 14, 2021. doi: 10.3748/wjg.v27.i26.3984
María B Pisano, Cecilia G Giadans, Diego M Flichman, Viviana E Ré, María V Preciado, Pamela Valva 
World J Gastroenterol 27(26):4018-4044. Published online Jul 14, 2021. doi: 10.3748/wjg.v27.i26.4018
Minireviews
Paulina Delgado-Gonzalez, Carlos A Gonzalez-Villarreal, Jorge A Roacho-Perez, Adriana G Quiroz-Reyes, Jose Francisco Islas, Juan Luis Delgado-Gallegos, Daniel Arellanos-Soto, Kame A Galan-Huerta, Elsa N Garza-Treviño 
World J Gastroenterol 27(26):4160-4171. Published online Jul 14, 2021. doi: 10.3748/wjg.v27.i26.4160
Basic Study
Retrospective Study
Correction
Letter to the Editor