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Kota Tsuruya, Masashi Matsushima, Takayuki Nakajima, Mia Fujisawa, Katsuya Shirakura, Muneki Igarashi, Jun Koike, Takayoshi Suzuki, Tetsuya Mine 
World J Gastrointest Endosc 5(8):407-411. Published online Aug 16, 2013. doi: 10.4253/wjge.v5.i8.407
Koichiro Tsutsumi, Hironari Kato, Ichiro Sakakihara, Naoki Yamamoto, Yasuhiro Noma, Shigeru Horiguchi, Ryo Harada, Hiroyuki Okada, Kazuhide Yamamoto 
World J Gastrointest Endosc 5(8):412-416. Published online Aug 16, 2013. doi: 10.4253/wjge.v5.i8.412
Abd Elrazek M Aly Abd Elrazek, Nakamura Yoko, Moriguchi Hiroki, Mohamed Afify, Mohamed Asar, Badr Ismael, Magdy Salah 
World J Gastrointest Endosc 5(8):417-419. Published online Aug 16, 2013. doi: 10.4253/wjge.v5.i8.417