Classification of atrophic mucosal patterns on Blue LASER Imaging for endoscopic diagnosis of Helicobacter pylori-related gastritis: A retrospective, observational study. oleh Yoshiyuki Nishikawa, Yoshio Ikeda, Hidehiro Murakami, Shin-Ichiro Hori, Kaori Hino, Chise Sasaki, Megumi Nishikawa