1. Department of Gastroenterology and Hepatology, Fukuchiyama City Hospital, Fukuchiyama City, Kyoto 620‑8505, Japan
2. Department of Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto 602‑856, Japan
3. Department of Oncology, Fukuchiyama City Hospital, Fukuchiyama, Kyoto 620‑8505, Japan
4. Department of Pathology, Fukuchiyama City Hospital, Fukuchiyama, Kyoto 620‑8505, Japan