1. Department of Gastroenterology and Metabology, Ehime University Graduate School of Medicine, Toon 791-0295, Ehime, Japan
2. Interventional Hepatology Division, Department of Hepatology, Bangabandhu Sheikh Mujib Medical University, BSMMU, Dhaka 1000, Bangladesh
3. Department of Microbiology, Faculty of Medicine, Oita University, Yufu 879-5593, Oita, Japan