1. Division of Community Oral Health Science, Department of Health Promotion, Kyushu Dental College, Kitakyushu 803-8580, Japan
2. Department of Nutrition, Faculty of Home Economics, Kyushu Women's University, Kitakyushu 807-8586, Japan
3. Division of General Internal Medicine, Department of Health Promotion, Kyushu Dental College, Kitakyushu 803-8580, Japan