1. Department of Clinical Research National Hospital Organization Tochigi Medical Center, Nakatomatsuri Utsunomiya Tochigi Japan
2. Institute for Open and Transdisciplinary Research Initiatives Osaka University Toyonaka Osaka Japan
3. Division of Community and Family Medicine Jichi Medical University Shimotsuke Tochigi Japan
4. Department of Dentistry and Oral Surgery, School of Medicine Keio University Shinjyuku Tokyo Japan