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Open-Access Journal
Frontier
Hussein Hassan Okasha, Abeer Awad, Ahmed El-meligui, Reem Ezzat, Ashraf Aboubakr, Sameh AbouElenin, Ramy El-Husseiny, Ahmed Alzamzamy 
World J Gastroenterol 27(21):2664-2680. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2664
Review
Michela Visani, Giorgia Acquaviva, Antonio De Leo, Viviana Sanza, Lidia Merlo, Thais Maloberti, Alba A Brandes, Enrico Franceschi, Monica Di Battista, Michele Masetti, Elio Jovine, Sirio Fiorino, Annalisa Pession, Giovanni Tallini, Dario de Biase 
World J Gastroenterol 27(21):2710-2726. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2710
Efthymios P Tsounis, Evanthia Tourkochristou, Athanasia Mouzaki, Christos Triantos 
World J Gastroenterol 27(21):2727-2757. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2727
Minireviews
Sohan Lal Solanki, Saneya Pandrowala, Abhirup Nayak, Manish Bhandare, Reshma P Ambulkar, Shailesh V Shrikhande 
World J Gastroenterol 27(21):2758-2770. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2758
Stella Compagnoni, Erica Maria Bruno, Giorgio Madonia, Marco Cannizzaro, Salvatore Madonia 
World J Gastroenterol 27(21):2771-2783. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2771
Fabrizio Romano, Marco Chiarelli, Mattia Garancini, Mauro Scotti, Mauro Zago, Gerardo Cioffi, Matilde De Simone, Ugo Cioffi 
World J Gastroenterol 27(21):2784-2794. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2784
Barry L Werth, Sybele-Anne Christopher 
World J Gastroenterol 27(21):2795-2817. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2795
Basic Study
Sarah Musa Hammoudeh, Arabella Musa Hammoudeh, Poorna Manasa Bhamidimarri, Bassam Mahboub, Rabih Halwani, Qutayba Hamid, Mohamed Rahmani, Rifat Hamoudi 
World J Gastroenterol 27(21):2850-2870. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2850
Clinical and Translational Research
Zai-Sheng Ye, Miao Zheng, Qin-Ying Liu, Yi Zeng, Sheng-Hong Wei, Yi Wang, Zhi-Tao Lin, Chen Shu, Qiu-Hong Zheng, Lu-Chuan Chen 
World J Gastroenterol 27(21):2871-2894. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2871
Retrospective Study
Deng Han, Yuan-Liang Li, Zhi-Wei Zhou, Fei Yin, Jie Chen, Fang Liu, Yan-Fen Shi, Wei Wang, Yu Zhang, Xian-Jun Yu, Jian-Ming Xu, Run-Xiang Yang, Chao Tian, Jie Luo, Huang-Ying Tan 
World J Gastroenterol 27(21):2895-2909. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2895
Observational Study
Ji-Yuan Zhou, Liu-Wei Song, Rong Yuan, Xiao-Ping Lu, Gui-Qiang Wang 
World J Gastroenterol 27(21):2910-2920. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2910
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