Katsuro Ichimasa, MD, PhD ⁎ 
Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan
Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
∗Corresponding author: Katsuro Ichimasa, MD, PhD, Digestive Disease Center, Showa University Northern Yokohama Hospital, 35-1 Chigasaki-chuo, Tsuzuki-ku, Yokohama 224-8503, Japan.Digestive Disease CenterShowa University Northern Yokohama Hospital35-1 Chigasaki-chuoTsuzuki-kuYokohama224-8503Japan
Shin-ei Kudo, MD, PhD
Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan
Takemasa Hayashi, MD, PhD
Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan
Tatsuya Sakurai, MD, PhD
Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan
Tetsuo Nemoto, MD, PhD
Department of Diagnostic Pathology, Showa University Northern Yokohama Hospital, Yokohama, Japan
Masashi Misawa, MD, PhD
Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan
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