Institution: | 1. Department of Gastroenterology, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan 2. Department of Gastrointestinal Endoscopy, Yokohama City University, Yokohama, Japan 3. Department of Pathology, Yokohama City University, Yokohama, Japan
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