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Open-Access Journal
Editorial
Frontier
Giuseppe Privitera, Daniela Pugliese, Loris Riccardo Lopetuso, Franco Scaldaferri, Alfredo Papa, Gian Lodovico Rapaccini, Antonio Gasbarrini, Alessandro Armuzzi 
World J Gastroenterol 27(47):8047-8057. Published online Dec 21, 2021. doi: 10.3748/wjg.v27.i47.8047
Expert Consensus
Review
Rocío González Grande, Inmaculada Santaella Leiva, Susana López Ortega, Miguel Jiménez Pérez 
World J Gastroenterol 27(47):8081-8102. Published online Dec 21, 2021. doi: 10.3748/wjg.v27.i47.8081
Minireviews
Basic Study
Jia-Yi Liu, Zhu-Yuan Ding, Zi-Yi Zhou, Sheng-Zhen Dai, Jie Zhang, Hao Li, Qiu Du, Ye-Yu Cai, Quan-Liang Shang, Yong-Heng Luo, En-Hua Xiao 
World J Gastroenterol 27(47):8156-8165. Published online Dec 21, 2021. doi: 10.3748/wjg.v27.i47.8156
Retrospective Study
Ajalaya Teyateeti, Armeen Mahvash, James Long, Mohamed Abdelsalam, Rony Avritscher, Ahmed Kaseb, Bruno Odisio, Gregory Ravizzini, Devaki Surasi, Achiraya Teyateeti, Homer Macapinlac, Srinivas Cheenu Kappadath 
World J Gastroenterol 27(47):8166-8181. Published online Dec 21, 2021. doi: 10.3748/wjg.v27.i47.8166
Observational Study
Masashi Saito, Takeshi Yamamura, Masanao Nakamura, Keiko Maeda, Tsunaki Sawada, Eri Ishikawa, Yasuyuki Mizutani, Takuya Ishikawa, Naomi Kakushima, Kazuhiro Furukawa, Eizaburo Ohno, Hiroki Kawashima, Masatoshi Ishigami, Mitsuhiro Fujishiro 
World J Gastroenterol 27(47):8182-8193. Published online Dec 21, 2021. doi: 10.3748/wjg.v27.i47.8182
Letter to the Editor
Yasir Waheed 
World J Gastroenterol 27(47):8199-8200. Published online Dec 21, 2021. doi: 10.3748/wjg.v27.i47.8199