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Open-Access Journal
Editorial
Diamantis I Tsilimigras, Timothy Michael Pawlik, Dimitrios Moris 
World J Gastroenterol 27(15):1524-1530. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1524
Review
Fares E M Ali, Zuhair M Mohammedsaleh, Mahmoud M Ali, Osama M Ghogar 
World J Gastroenterol 27(15):1531-1552. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1531
Minireviews
Wisam Sbeit, Tawfik Khoury, Amir Mari 
World J Gastroenterol 27(15):1553-1562. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1553
Vicente Lorenzo-Zúñiga, Marco Bustamante-Balén, Vicente Pons-Beltrán 
World J Gastroenterol 27(15):1563-1568. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1563
Yuji Sakai, Masayuki Ohtsuka, Harutoshi Sugiyama, Rintaro Mikata, Shin Yasui, Izumi Ohno, Yotaro Iino, Jun Kato, Toshio Tsuyuguchi, Naoya Kato 
World J Gastroenterol 27(15):1569-1577. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1569
Basic Study
Kun Li, Yi-Fan Peng, Jing-Zhu Guo, Mei Li, Yu Zhang, Jing-Yi Chen, Ting-Ru Lin, Xin Yu, Wei-Dong Yu 
World J Gastroenterol 27(15):1595-1615. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1595
Monia Cecati, Matteo Giulietti, Alessandra Righetti, Berina Sabanovic, Francesco Piva 
World J Gastroenterol 27(15):1616-1629. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1616
Retrospective Cohort Study
Thiruvengadam Muniraj, Harry R Aslanian, Loren Laine, Priya A Jamidar, James F Farrell, Kisha A Mitchell, Ronald R Salem 
World J Gastroenterol 27(15):1630-1642. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1630
Retrospective Study
Case Report
Qing-Hua Yang, Xiao-Peng Ma, Dong-Ling Dai, Da-Ming Bai, Yu Zou, Si-Xi Liu, Jian-Ming Song 
World J Gastroenterol 27(15):1655-1663. Published online Apr 21, 2021. doi: 10.3748/wjg.v27.i15.1655
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