1 Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine, 65 Tsuruma‑cho, Showa‑ku, Nagoya, Aichi, 466‑8550, Japan.
2 Data Coordinating Center, Department of Advanced Medicine, Nagoya University Hospital, 65 Tsuruma‑cho, Showa‑ku, Nagoya, Aichi, 466‑8550, Japan.
3 Department of Endoscopy, Nagoya University Hospital, 65 Tsuruma‑cho, Showa‑ku, Nagoya, Aichi, 466‑8550, Japan. h-kawa@med.nagoya-u.ac.jp.