1. Divisions of Community Oral Health Science, Kyushu University, Faculty of Dental Science, Fukuoka
2. General Internal Medicine, Kyushu Dental College, Kyushu University, Faculty of Dental Science, Fukuoka
3. Department of Preventive Dentistry, Kyushu University, Faculty of Dental Science, Fukuoka
4. Keichiku Office for Health, Human Services, and Environmental Issues, Yukuhashi, Japan
5. Kitakyushu Public Health and Welfare Bureau, Kitakyushu, Kyushu University, Faculty of Dental Science, Fukuoka