1. Department of Welfare, Kansai Women’s College, Osaka 582-0026, Japan
2. Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
3. Department of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8549, Japan
4. Department of Basic Oral Health Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8549, Japan
5. Department of Nursing, Taisei Gakuin University, Osaka 587-8555, Japan
6. Graduate School, Division of Dental Research, Osaka Dental University, Osaka 573-1121, Japan