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Open-Access Journal
Frontier
Review
Júlio Maria Fonseca Chebli, Natália Sousa Freitas Queiroz, Adérson Omar Mourão Cintra Damião, Liliana Andrade Chebli, Márcia Henriques de Magalhães Costa, Rogério Serafim Parra 
World J Gastroenterol 27(11):1022-1042. Published online Mar 21, 2021. doi: 10.3748/wjg.v27.i11.1022
Retrospective Study
Takuya Satomi, Seiji Kawano, Tomoki Inaba, Masahiro Nakagawa, Hirokazu Mouri, Masao Yoshioka, Shoichi Tanaka, Tatsuya Toyokawa, Sayo Kobayashi, Takehiro Tanaka, Hiromitsu Kanzaki, Masaya Iwamuro, Yoshiro Kawahara, Hiroyuki Okada 
World J Gastroenterol 27(11):1043-1054. Published online Mar 21, 2021. doi: 10.3748/wjg.v27.i11.1043
Observational Study
José Carlos Rodrigues Nascimento, Lianna C Pereira, Juliana Magalhães C Rêgo, Ronaldo P Dias, Paulo Goberlânio B Silva, Silvio Alencar C Sobrinho, Gustavo R Coelho, Ivelise Regina C Brasil, Edmilson F Oliveira-Filho, James S Owen, Pierluigi Toniutto, Reinaldo B Oriá 
World J Gastroenterol 27(11):1064-1075. Published online Mar 21, 2021. doi: 10.3748/wjg.v27.i11.1064
Clinical Trials Study