1. Division of General Medicine, Center for Community Medicine, Jichi Medical University School of Medicine, Japan
2. Division of Community and Family Medicine, Center for Community Medicine, Jichi Medical University School of Medicine, Japan
3. Department of General Medicine, Toyooka Public Hospital, Japan
4. Division of Clinical Pathology and Immunology, Department of Internal Medicine Related, Kobe University Graduate School of Medicine, Japan
5. Department of Family and Community Medicine, Kobe University Graduate School of Medicine, Japan