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Sa1238 RETOSPECTIVE MULTICENTER STUDY OF PHOTODYNAMIC THERAPY FOR GASTRIC CANCERShimoyama, Yasuyuki; Nishiwaki, Yoshiro; Kuribayashi, Shiko; Hosaka, Hiroko; Kawamura, Osamu; Nakayama, Tetsuo; Tanaka, Hiroto; Tomizawa, Taku; Hoshi, Koki; Yamada, Toshiya; Kusano, Motoyasu · Gastrointestinal Endoscopy · 2018