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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
Jian-Xiong Hu, Cheng-Fei Zhao, Wen-Biao Chen, Qi-Cai Liu, Qu-Wen Li, Yan-Ya Lin, Feng Gao 
World J Gastroenterol 27(27):4298-4321. Published online Jul 21, 2021. doi: 10.3748/wjg.v27.i27.4298
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
Diogo Alpuim Costa, Carla Espiney Amaro, Ana Nunes, Joana Santos Cardoso, Pedro Modas Daniel, Isabel Rosa, João Vieira Branco 
World J Gastroenterol 27(27):4413-4428. Published online Jul 21, 2021. doi: 10.3748/wjg.v27.i27.4413
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
Kinga Kowalska-Duplaga, Anita Gawlik-Scislo, Elzbieta Krzesiek, Elzbieta Jarocka-Cyrta, Izabella Łazowska-Przeorek, Mariusz Duplaga, Aleksandra Banaszkiewicz 
World J Gastroenterol 27(27):4468-4480. Published online Jul 21, 2021. doi: 10.3748/wjg.v27.i27.4468
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