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Open-Access Journal
Review
Vincenzo Craviotto, Federica Furfaro, Laura Loy, Alessandra Zilli, Laurent Peyrin-Biroulet, Gionata Fiorino, Silvio Danese, Mariangela Allocca 
World J Gastroenterol 27(27):4276-4297. Published online Jul 21, 2021. doi: 10.3748/wjg.v27.i27.4276
Qi-Chao Ge, Christoph F Dietrich, Manoop S Bhutani, Bao-Zhen Zhang, Yue Zhang, Yi-Dan Wang, Jing-Jing Zhang, Yu-Fan Wu, Si-Yu Sun, Jin-Tao Guo 
World J Gastroenterol 27(27):4342-4357. Published online Jul 21, 2021. doi: 10.3748/wjg.v27.i27.4342
Minireviews
Retrospective Study
Noriyuki Isohata, Koichi Nagata, Kenichi Utano, Ryoichi Nozaki, Satoshi Nozu, Takashi Kato, Shigeyoshi Kijima, Hiroshi Matsumoto, Kenichiro Majima, Yasuji Ryu, Michiaki Hirayama, Shungo Endo 
World J Gastroenterol 27(27):4441-4452. Published online Jul 21, 2021. doi: 10.3748/wjg.v27.i27.4441
Observational Study
Prospective Study
Letter to the Editor