1. Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
2. Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
3. Center for Cohort Studies, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
4. Department of Ophthalmology, Oita University Faculty of Medicine, Oita, Japan
5. Tajimi Iwase Eye Clinic, Tajimi, Japan
6. Kanto Central Hospital of the Mutual Aid Association of Public School Teachers, Tokyo, Japan
7. Tawara Eye Clinic, Fukuoka, Japan
8. Department of Orthoptics, Faculty of Medicine, Fukuoka International University of Health and Welfare, Fukuoka, Japan