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Basic Study
Case Control Study
Retrospective Cohort Study
Retrospective Study
Kazuhiro Toriyama, Masahiro Tajika, Tsutomu Tanaka, Makoto Ishihara, Yutaka Hirayama, Sachiyo Onishi, Nobumasa Mizuno, Takamichi Kuwahara, Nozomi Okuno, Shinpei Matsumoto, Eiichi Sasaki, Tetsuya Abe, Yasushi Yatabe, Kazuo Hara, Keitaro Matsuo, Tsuneo Tamaki, Yasumasa Niwa 
World J Gastroenterol 25(46):6767-6780. Published online Dec 14, 2019. doi: 10.3748/wjg.v25.i46.6767
Pei-Pei Xu, Xiao-Pan Chang, Xi Zhang, Shui-Qing Chi, Guo-Qing Cao, Shuai Li, De-Hua Yang, Xiang-Yang Li, Shao-Tao Tang 
World J Gastroenterol 25(46):6781-6789. Published online Dec 14, 2019. doi: 10.3748/wjg.v25.i46.6781
Randomized Controlled Trial
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