1. Department of Health Science, Shiga University of Medical Science, Shiga, Japan
2. Sleep Center, Foothills Medical Center, Calgary, Alberta, Canada
3. Tsuruga Nursing University, Tsuruga-city, Fukui, Japan
4. Department of Community Health Sciences, University of Calgary, Calgary, AL, Canada
5. Department of Cardiovascular Epidemiology, Kyoto Women's University, Kyoto, Japan
6. Takashima General Hospital, Shiga, Japan
7. Makino Hospital, Takashima, Japan
8. Otsu Red Cross Hospital, Shiga, Japan
9. Shiga Medical Center for Adults, Shiga, Japan
10. The First Institute for Health Promotion and Health Care, Tokyo, Japan