Koichi Miyaki1,2
, Katsunori Masaki1
, Mariko Naito3
, Toru Naito4
, Keika Hoshi5
, Asako Hara1
, Shugo Tohyama1
and Takeo Nakayama6 
1Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Tokyo, Japan
2Department of Molecular Epidemiology, Medical Research Institute, Tokyo Medical & Dental University, Tokyo, Japan
3Department of Preventive Medicine/Biostatistics and Medical Decision Making, Nagoya University Graduate School of Medicine, Aichi, Japan
4Section of General Dentistry, Department of General Dentistry, Fukuoka Dental College, Fukuoka, Japan
5Japan Council for Quality Health Care, Tokyo, Japan
6Department of Health Informatics, Kyoto University School of Public Health, Kyoto, Japan