1. Department of Ophthalmology, Juntendo University Graduate School of Medicine, Tokyo, Japan
2. Department of Ophthalmology, Juntendo Tokyo Koto Geriatric Medical Center, Tokyo, Japan
3. Department of Ophthalmology, Juntendo University School of Medicine, Tokyo, Japan
4. Department of Orthopaedic Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
5. Department of Ophthalmology, Kyorin University School of Medicine, Tokyo, Japan
6. Section of Clinical Epidemoilogy, Department of Community Medicine, Kyoto University, Graduate School of Medicine, Tokyo, Japan
7. Shirakawa Star in General Medicine, Fukushima Medical University, Fukushima, Japan