1. Department of Gastroenterology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Japan
2. Department of Rheumatology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Japan
3. Department of Gastroenterology, Fukuoka Sanno Hospital, Japan
4. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Japan