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Open-Access Journal
Editorial
Joaquina Martínez-Galán, Isabel Rodriguez, Octavio Caba 
World J Gastroenterol 27(39):6515-6521. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6515
Frontier
Georgios Neokosmidis, Evangelos Cholongitas, Konstantinos Tziomalos 
World J Gastroenterol 27(39):6522-6526. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6522
Review
Ufuk Koca Caliskan, Methiye Mancak Karakus 
World J Gastroenterol 27(39):6551-6571. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6551
Minireviews
Anupam Singh, Sharad Srivastava, Saurabh Dawra, T V S V G K Tilak, Manish Manrai 
World J Gastroenterol 27(39):6572-6589. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6572
Enrique Rodríguez de Santiago, Eduardo Albéniz, Fermin Estremera-Arevalo, Carlos Teruel Sanchez-Vegazo, Vicente Lorenzo-Zúñiga 
World J Gastroenterol 27(39):6601-6614. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6601
Basic Study
Jing-Chun Qin, Wei-Tao Yu, Hui-Xuan Li, Yu-Qi Liang, Fei-Fei Nong, Bin Wen 
World J Gastroenterol 27(39):6615-6630. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6615
Guo-Li Gu, Zhi Zhang, Yu-Hui Zhang, Ying Yuan, Hai-Rui Yang, Zhi-Wei Dong, Peng-Fei Yu 
World J Gastroenterol 27(39):6631-6646. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6631
Clinical and Translational Research
Sara Cococcia, Marco Vincenzo Lenti, Caterina Mengoli, Catherine Klersy, Federica Borrelli de Andreis, Matteo Secco, Jihane Ghorayeb, Mariangela Delliponti, Gino Roberto Corazza, Antonio Di Sabatino 
World J Gastroenterol 27(39):6647-6658. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6647
Retrospective Cohort Study
Masaya Nakauchi, Koichi Suda, Susumu Shibasaki, Kenichi Nakamura, Shinichi Kadoya, Kenji Kikuchi, Kazuki Inaba, Ichiro Uyama 
World J Gastroenterol 27(39):6659-6672. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6659
Observational Study
Tadeusz Sebzda, Jan Gnus, Barbara Dziadkowiec, Miroslaw Latka, Jakub Gburek 
World J Gastroenterol 27(39):6673-6688. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6673
Joaquin Cubiella, María Lorenzo, Franco Baiocchi, Coral Tejido, Alejandro Conde, María Sande-Meijide, Margarita Castro 
World J Gastroenterol 27(39):6689-6700. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6689
Prospective Study
Bo Li, Pan-Yu Chen, Yi-Fei Tan, He Huang, Min Jiang, Zhen-Ru Wu, Chen-Hao Jiang, Dao-Feng Zheng, Diao He, Yu-Jun Shi, Yan Luo, Jia-Yin Yang 
World J Gastroenterol 27(39):6701-6714. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6701
Systematic Reviews
Letter to the Editor
Giuseppe Lanza, Massimiliano Godani, Raffaele Ferri, Alberto Raggi 
World J Gastroenterol 27(39):6733-6736. Published online Oct 21, 2021. doi: 10.3748/wjg.v27.i39.6733
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