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Open-Access Journal
Review
Gabriela Gama Freire Alberca, Rosa Liliana Solis-Castro, Maria Edith Solis-Castro, Ricardo Wesley Alberca 
World J Gastroenterol 27(13):1255-1266. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1255
Rahul Chaudhari, Sherouk Fouda, Ashik Sainu, Joseph M Pappachan 
World J Gastroenterol 27(13):1267-1282. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1267
Minireviews
Aqsa Ahmad, Syeda Momna Ishtiaq, Junaid Ali Khan, Rizwan Aslam, Sultan Ali, Muhammad Imran Arshad 
World J Gastroenterol 27(13):1296-1310. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1296
Retrospective Cohort Study
Gopal Veeraraghavan, Amelie Therrien, Maya Degroote, Allison McKeown, Paul D Mitchell, Jocelyn A Silvester, Daniel A Leffler, Alan M Leichtner, Ciaran P Kelly, Dascha C Weir 
World J Gastroenterol 27(13):1311-1320. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1311
Retrospective Study
Toshihiro Nishizawa, Shuntaro Yoshida, Akira Toyoshima, Tomoharu Yamada, Yoshiki Sakaguchi, Taiga Irako, Hirotoshi Ebinuma, Takanori Kanai, Kazuhiko Koike, Osamu Toyoshima 
World J Gastroenterol 27(13):1321-1329. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1321
Scientometrics
Sa'ed H Zyoud, Simon Smale, W Stephen Waring, Waleed Sweileh, Samah W Al-Jabi 
World J Gastroenterol 27(13):1341-1353. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1341
Case Report
Qiong Zhang, Jie-Ying Zhao, Hua Zhuang, Chun-Yan Lu, Jin Yao, Yuan Luo, Yong-Yang Yu 
World J Gastroenterol 27(13):1354-1361. Published online Apr 7, 2021. doi: 10.3748/wjg.v27.i13.1354
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