1. Department of Gastroenterology, Saiseikai Futsukaichi Hospital, Fukuoka, Japan
2. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
3. Department of Gastroenterology, Harasanshin Hospital, Fukuoka, Japan
4. Department of Gastroenterology and Metabolism, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan