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Open-Access Journal
Opinion Review
Sandra Strainiene, Milda Peciulyte, Tomas Strainys, Ieva Stundiene, Ilona Savlan, Valentina Liakina, Jonas Valantinas 
World J Gastroenterol 27(32):5297-5305. Published online Aug 28, 2021. doi: 10.3748/wjg.v27.i32.5297
Review
Smaranda Diaconescu, Georgiana Emmanuela Gîlcă-Blanariu, Silvia Poamaneagra, Otilia Marginean, Gabriela Paduraru, Gabriela Stefanescu 
World J Gastroenterol 27(32):5322-5340. Published online Aug 28, 2021. doi: 10.3748/wjg.v27.i32.5322
Minireviews
Basic Study
Zi-Yi Wang, Jian-Yu Lin, Yang-Rong Feng, De-Shun Liu, Xu-Zi Zhao, Tong Li, Si-Yuan Li, Jing-Chao Sun, Shu-Feng Li, Wen-Yan Jia, Hui-Rong Jing 
World J Gastroenterol 27(32):5404-5423. Published online Aug 28, 2021. doi: 10.3748/wjg.v27.i32.5404
Retrospective Study
Ning-Yi Cui, Xuan-Tong Gong, Yan-Tao Tian, Yong Wang, Rui Zhang, Meng-Jia Liu, Jie Han, Bo Wang, Di Yang 
World J Gastroenterol 27(32):5438-5447. Published online Aug 28, 2021. doi: 10.3748/wjg.v27.i32.5438
Observational Study
Lorenzo Norsa, Pietro Andrea Bonaffini, Maja Caldato, Cristiana Bonifacio, Aurelio Sonzogni, Amedeo Indriolo, Clarissa Valle, Federica Furfaro, Alice Bonanomi, Paolo Niccolò Franco, Mauro Gori, Veronica Smania, Lucia Scaramella, Laura Forzenigo, Maurizio Vecchi, Monica Solbiati, Giorgio Costantino, Silvio Danese, Lorenzo D'Antiga, Sandro Sironi, Luca Elli 
World J Gastroenterol 27(32):5448-5459. Published online Aug 28, 2021. doi: 10.3748/wjg.v27.i32.5448