1. Department of Community Based Medical System, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan
2. Department of General Internal Medicine, Hiroshima University Hospital, Japan
3. Department of Rheumatology, Fukushima Medical University School of Medicine, Japan
4. Division of Rheumatology, Kurume University Medical Center, Japan
5. Department of General Internal Medicine, Hiroshima-Nishi Medical Center, Japan
6. Department of Gastroenterology, Fukushima Medical University School of Medicine, Japan