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Open-Access Journal
Review
Sudeep Tanwar, Freya Rhodes, Ankur Srivastava, Paul M Trembling, William M Rosenberg 
World J Gastroenterol 26(2):109-133. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.109
Basic Study
Fa-Peng Zhang, Yi-Pei Huang, Wei-Xin Luo, Wan-Yu Deng, Chao-Qun Liu, Lei-Bo Xu, Chao Liu 
World J Gastroenterol 26(2):134-153. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.134
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
Wan-Ru Ma, Peng Xu, Zhao-Jun Liu, Jing Zhou, Lian-Kun Gu, Jun Zhang, Da-Jun Deng 
World J Gastroenterol 26(2):184-198. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.184
Xin-Yue Lv, Hui-Guo Ding, Jun-Fu Zheng, Chun-Lei Fan, Lei Li 
World J Gastroenterol 26(2):199-218. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.199
Systematic Review
Eunice Xiang-Xuan Tan, Min-Xian Wang, Junxiong Pang, Guan-Huei Lee 
World J Gastroenterol 26(2):219-245. Published online Jan 14, 2020. doi: 10.3748/wjg.v26.i2.219
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
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