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Open-Access Journal
Review
Moon-Sing Lee, Wen-Yen Chiou, Shih-Kai Hung, Hon-Yi Lin, Liang-Cheng Chen 
World J Gastroenterol 27(20):2434-2457. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2434
Yong-Lin Yang, Yu-Chen Nan 
World J Gastroenterol 27(20):2458-2473. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2458
Emanuele Nicastro, Lorenzo Norsa, Angelo Di Giorgio, Giuseppe Indolfi, Lorenzo D'Antiga 
World J Gastroenterol 27(20):2474-2494. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2474
Minireviews
Igor Braga Ribeiro, Epifanio Silvino do Monte Junior, Antonio Afonso Miranda Neto, Igor Mendonça Proença, Diogo Turiani Hourneaux de Moura, Mauricio Kazuyoshi Minata, Edson Ide, Marcos Eduardo Lera dos Santos, Gustavo de Oliveira Luz, Sergio Eiji Matuguma, Spencer Cheng, Renato Baracat, Eduardo Guimarães Hourneaux de Moura 
World J Gastroenterol 27(20):2495-2506. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2495
Shao-Long Chen, Guo-Ping Wang, Dan-Rong Shi, Shu-Hao Yao, Ke-Da Chen, Hang-Ping Yao 
World J Gastroenterol 27(20):2507-2520. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2507
Paulina Núñez F, Noa Krugliak Cleveland, Rodrigo Quera, David T Rubin 
World J Gastroenterol 27(20):2521-2530. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2521
Soma Kobayashi, Joel H Saltz, Vincent W Yang 
World J Gastroenterol 27(20):2545-2575. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2545
Alessandro Signorello, Ilaria Lenci, Martina Milana, Giuseppe Grassi, Leonardo Baiocchi 
World J Gastroenterol 27(20):2576-2585. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2576
Basic Study
Guang-Lin Lei, Yan Niu, Si-Jie Cheng, Yuan-Yuan Li, Zhi-Fang Bai, Ling-Xiang Yu, Zhi-Xian Hong, Hu Liu, Hong-Hong Liu, Jin Yan, Yuan Gao, Shao-Geng Zhang, Zhu Chen, Rui-Sheng Li, Peng-Hui Yang 
World J Gastroenterol 27(20):2586-2602. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2586
Retrospective Cohort Study
Knut EA Lundin, Ciaran P Kelly, David S Sanders, Kristina Chen, Sheena Kayaniyil, Sisi Wang, Rajvi J Wani, Caitlin Barrett, Shakira Yoosuf, Ellen S Pettersen, Robert Sambrook, Daniel A Leffler 
World J Gastroenterol 27(20):2603-2614. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2603
Observational Study
Emir Tulumović, Nermin Salkić, Denijal Tulumović 
World J Gastroenterol 27(20):2630-2642. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2630
Meta-Analysis
Case Report
Hiroko Sato, Tsuyoshi Shirai, Hiroshi Fujii, Tomonori Ishii, Hideo Harigae 
World J Gastroenterol 27(20):2657-2663. Published online May 28, 2021. doi: 10.3748/wjg.v27.i20.2657
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