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Open-Access Journal
Review
Basic Study
Retrospective Cohort Study
Chih-Hsiung Hsu, Cheng-Wen Hsiao, Chien-An Sun, Wen-Chih Wu, Tsan Yang, Je-Ming Hu, Chi-Hua Huang, Yu-Chan Liao, Chao-Yang Chen, Fu-Huang Lin, Yu-Ching Chou 
World J Gastroenterol 26(2):154-167. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.154
Observational Study
Systematic Review
Meta-Analysis
Konstantinos Gkiouras, Maria G Grammatikopoulou, Xenophon Theodoridis, Eirini Pagkalidou, Evangelia Chatzikyriakou, Anna G Apostolidou, Eirini I Rigopoulou, Lazaros I Sakkas, Dimitrios Petrou Bogdanos 
World J Gastroenterol 26(2):246-265. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.246