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Opinion Review
Review
Minireviews
Anna Mrzljak, Petra Dinjar-Kujundzic, Lorena Jemersic, Jelena Prpic, Ljubo Barbic, Vladimir Savic, Vladimir Stevanovic, Tatjana Vilibic-Cavlek 
World J Gastroenterol 25(25):3168-3182. Published online Jul 7, 2019. doi: 10.3748/wjg.v25.i25.3168
Basic Study
Retrospective Study
Observational Study
Meta-Analysis
Retraction Note
Hong-Bo Shi, Jin-Li Lou, Hong-Lin Shi, Feng Ren, Yu Chen, Zhong-Ping Duan 
World J Gastroenterol 25(25):3281-3282. Published online Jul 7, 2019. doi: 10.3748/wjg.v25.i25.3281