1. Division of Preventive Medicine, Department of Medicine Brigham and Women's Hospital and Harvard Medical School Boston Massachusetts USA
2. Department of Epidemiology Harvard T.H. Chan School of Public Health Boston Massachusetts USA
3. Department of Cardiology Tokyo Medical and Dental University Tokyo Japan
4. Department of Periodontology Kanagawa Dental University Kanagawa Japan
5. Department of Periodontology Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University Tokyo Japan
6. Department of Cardiology Sakakibara Heart Institute Tokyo Japan