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Opinion Review
Review
Olorunseun O Ogunwobi, Trisheena Harricharran, Jeannette Huaman, Anna Galuza, Oluwatoyin Odumuwagun, Yin Tan, Grace X Ma, Minhhuyen T Nguyen 
World J Gastroenterol 25(19):2279-2293. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2279
Minireviews
Kosuke Minaga, Tomohiro Watanabe, Hobyung Chung, Masatoshi Kudo 
World J Gastroenterol 25(19):2308-2314. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2308
Basic Study
Case Control Study
Retrospective Study
Xiao-Hao Zheng, Wen Zhang, Lin Yang, Chun-Xia Du, Ning Li, Gu-Sheng Xing, Yan-Tao Tian, Yi-Bin Xie 
World J Gastroenterol 25(19):2338-2353. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2338
Observational Study
Elisa Sollelis, Régine Minet Quinard, Guillaume Bouguen, Marion Goutte, Félix Goutorbe, Damien Bouvier, Bruno Pereira, Gilles Bommelaer, Anthony Buisson 
World J Gastroenterol 25(19):2354-2364. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2354
Prospective Study
Hidekatsu Kuorda, Tamami Abe, Yudai Fujiwara, Takuya Okamoto, Miki Yonezawa, Hiroki Sato, Kei Endo, Takayoshi Oikawa, Kei Sawara, Yasuhiro Takikawa 
World J Gastroenterol 25(19):2365-2372. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2365
Randomized Controlled Trial
Xiang-Lei Yuan, Bin Wei, Lian-Song Ye, Chun-Cheng Wu, Qing-Hua Tan, Ming-Hong Yao, Yu-Hang Zhang, Xian-Hui Zeng, Yan Li, Yu-Yan Zhang, Bing Hu 
World J Gastroenterol 25(19):2373-2382. Published online May 21, 2019. doi: 10.3748/wjg.v25.i19.2373
Meta-Analysis
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