1. Department of Gastroenterology and Neurology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761‑0793, Japan
2. Department of Medical Technology, Kagawa Prefectural University of Health Sciences, Takamatsu, Kagawa 761‑0123, Japan
3. Department of Hepatology, Kagawa Prefectural Central Hospital, Takamatsu, Kagawa 760‑8557, Japan
4. Department of Gastroenterology and Hepatology, Takamatsu Red Cross Hospital, Takamatsu, Kagawa 760‑0017, Japan
5. Department of Gastroenterology, Mitoyo General Hospital, Kanonji, Kagawa 769‑1695, Japan
6. Department of Gastroenterology, Kagawa Rosai Hospital, Marugame, Kagawa 763‑8502, Japan