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Open-Access Journal
Minireviews
Anna Mrzljak, Lucija Bajkovec, Tatjana Vilibic-Cavlek 
World J Gastroenterol 27(2):143-151. Published online Jan 14, 2021. doi: 10.3748/wjg.v27.i2.143
Basic Study
Yong-Woo Kim, Hak Jin Kim, Byung Mann Cho, Seon Hee Choi 
World J Gastroenterol 27(2):152-161. Published online Jan 14, 2021. doi: 10.3748/wjg.v27.i2.152
Case Control Study
Kei Motooka, Koichi Morishita, Nami Ito, Shinichiro Shinzaki, Taku Tashiro, Satoshi Nojima, Kayoko Shimizu, Mutsuhiro Date, Natsumi Sakata, Momoko Yamada, Shinji Takamatsu, Yoshihiro Kamada, Hideki Iijima, Tsunekazu Mizushima, Eiichi Morii, Tetsuo Takehara, Eiji Miyoshi 
World J Gastroenterol 27(2):162-175. Published online Jan 14, 2021. doi: 10.3748/wjg.v27.i2.162
Retrospective Cohort Study
Retrospective Study
Observational Study
Cyrla Zaltman, Rogério Serafim Parra, Ligia Yukie Sassaki, Genoile Oliveira Santana, Maria de Lourdes Abreu Ferrari, Sender J Miszputen, Heda M B S Amarante, Roberto Luiz Kaiser Junior, Cristina Flores, Wilson R Catapani, José Miguel Luz Parente, Mauro Bafutto, Odery Ramos, Carolina D Gonçalves, Isabella Miranda Guimaraes, Jose J R da Rocha, Marley R Feitosa, Omar Feres, Rogerio Saad-Hossne, Francisco Guilherme Cancela Penna, Pedro Ferrari Sales Cunha, Tarcia NF Gomes, Rodrigo Bremer Nones, Mikaell Alexandre Gouvea Faria, Mírian Perpétua Palha Dias Parente, António S Scotton, Rosana Fusaro Caratin, Juliana Senra, Júlio Maria Chebli 
World J Gastroenterol 27(2):208-223. Published online Jan 14, 2021. doi: 10.3748/wjg.v27.i2.208
Randomized Controlled Trial
You-Dong Wan, Rui-Xue Zhu, Zhong-Zheng Bian, Tong-Wen Sun 
World J Gastroenterol 27(2):224-232. Published online Jan 14, 2021. doi: 10.3748/wjg.v27.i2.224
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