1. Section of Geriatric Dentistry and Perioperative Medicine in Dentistry, Division of Maxillofacial Diagnostic and Surgical Sciences, Faculty of Dental Science Kyushu University Fukuoka Japan
2. OBT Research Center, Faculty of Dental Science Kyushu University Fukuoka Japan
3. Department of Nursing Fukuoka Nursing College Fukuoka Japan
4. National Hospital Organization Fukuoka‐higashi Medical Center Fukuoka Japan
5. Section of Geriatric Dentistry, Department of General Dentistry Fukuoka Dental College Fukuoka Japan