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Retrospective Cohort Study
Retrospective Study
Yutaka Hirayama, Takafumi Ando, Yoshiki Hirooka, Osamu Watanabe, Ryoji Miyahara, Masanao Nakamura, Takeshi Yamamura, Hidemi Goto 
World J Gastrointest Endosc 8(6):301-309. Published online Mar 25, 2016. doi: 10.4253/wjge.v8.i6.301
Systematic Reviews