Dual red imaging: a novel endoscopic imaging technology visualizing thick blood vessels in the gastrointestinal wall oleh Naohisa Yahagi, Ai Fujimoto, Joichiro Horii, Toshio Uraoka, Masayuki Shimoda, Kaoru Takabayashi, Toshihiro Nisizawa, Osamu Goto, Yasutoshi Ochiai, Tadateru Maehata, Atushi Nakayama, Motohiko Kato, Naoki Hosoe, Makoto Naganuma