1. Department of Medical Technology, Kagawa Prefectural University of Health Sciences, Takamatsu, Kagawa 761‑0123, Japan
2. Department of Gastroenterology and Neurology, Kagawa University, Faculty of Medicine, Miki-cho, Kagawa 761‑0793, Japan
3. Medico Consl Co, Ltd., Suita, Osaka 565‑0824, Japan