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Open-Access Journal
Editorial
Efthymios P Tsounis, Athanasia Mouzaki, Christos Triantos 
World J Gastroenterol 27(41):7005-7013. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7005
Frontier
Pilar García-Peñarrubia, Antonio José Ruiz-Alcaraz, Miriam Ruiz-Ballester, Tamara Nadira Ramírez-Pávez, María Martínez-Esparza 
World J Gastroenterol 27(41):7014-7024. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7014
Review
Jaime García-Mena, Karina Corona-Cervantes, Daniel Cuervo-Zanatta, Tizziani Benitez-Guerrero, Juan Manuel Vélez-Ixta, Norma Gabriela Zavala-Torres, Loan Edel Villalobos-Flores, Fernando Hernández-Quiroz, Claudia Perez-Cruz, Selvasankar Murugesan, Fernando Guadalupe Bastida-González, Paola Berenice Zárate-Segura 
World J Gastroenterol 27(41):7065-7079. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7065
Minireviews
Basic Study
Hiroyuki Terasawa, Hideaki Kinugasa, Kazuhiro Nouso, Shumpei Yamamoto, Mami Hirai, Takehiro Tanaka, Akinobu Takaki, Hiroyuki Okada 
World J Gastroenterol 27(41):7134-7143. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7134
Selene Garcia-Garcia, Maria Francesca Cortese, David Tabernero, Josep Gregori, Marta Vila, Beatriz Pacín, Josep Quer, Rosario Casillas, Laura Castillo-Ribelles, Roser Ferrer-Costa, Ariadna Rando-Segura, Jesús Trejo-Zahínos, Tomas Pumarola, Ernesto Casis, Rafael Esteban, Mar Riveiro-Barciela, Maria Buti, Francisco Rodríguez-Frías 
World J Gastroenterol 27(41):7144-7158. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7144
Retrospective Cohort Study
Retrospective Study
Kentaro Yamada, Tsunaki Sawada, Masanao Nakamura, Takeshi Yamamura, Keiko Maeda, Eri Ishikawa, Tadashi Iida, Yasuyuki Mizutani, Naomi Kakushima, Takuya Ishikawa, Kazuhiro Furukawa, Eizaburo Ohno, Takashi Honda, Hiroki Kawashima, Masatoshi Ishigami, Satoshi Furune, Tetsunari Hase, Kenji Yokota, Osamu Maeda, Naozumi Hashimoto, Masashi Akiyama, Yuichi Ando, Mitsuhiro Fujishiro 
World J Gastroenterol 27(41):7190-7206. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7190
Letter to the Editor
Iyad Khamaysi, Eyal Zussman 
World J Gastroenterol 27(41):7207-7209. Published online Nov 7, 2021. doi: 10.3748/wjg.v27.i41.7207