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Opinion Review
Review
Caterina Sagnelli, Mariantonietta Pisaturo, Federica Calò, Salvatore Martini, Evangelista Sagnelli, Nicola Coppola 
World J Gastroenterol 25(26):3299-3312. Published online Jul 14, 2019. doi: 10.3748/wjg.v25.i26.3299
Chonlada Krutsri, Mitsuhiro Kida, Hiroshi Yamauchi, Tomohisa Iwai, Hiroshi Imaizumi, Wasaburo Koizumi 
World J Gastroenterol 25(26):3313-3333. Published online Jul 14, 2019. doi: 10.3748/wjg.v25.i26.3313
Minireviews
Timothy N Archampong, Richard H Asmah, Cathy J Richards, Vicki J Martin, Christopher D Bayliss, Edília Botão, Leonor David, Sandra Beleza, Carla Carrilho 
World J Gastroenterol 25(26):3344-3358. Published online Jul 14, 2019. doi: 10.3748/wjg.v25.i26.3344
Basic Study
Retrospective Study
Observational Study
Systematic Reviews
Dimitrios Papaconstantinou, Diamantis I Tsilimigras, Dimitrios Moris, Adamantios Michalinos, Aikaterini Mastoraki, Efstratia Mpaili, Natasha Hasemaki, Anargyros Bakopoulos, Dimitrios Filippou, Dimitrios Schizas 
World J Gastroenterol 25(26):3438-3449. Published online Jul 14, 2019. doi: 10.3748/wjg.v25.i26.3438
Meta-Analysis
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