1. Department of Ophthalmology, The Jikei University School of Medicine, Nishi-shimbashi, Tokyo, Japan
2. Department of Ophthalmology, Machida Municipal Hospital, Machida, Tokyo, Japan
3. Department of Ophthalmology, Atsugi City Hospital, Atsugi, Kanagawa, Japan
4. Yoshikawa Eye Clinic, Machida, Tokyo, Japan
5. Department of Preventive Medicine, Tokai University School of Medicine, Isehara, Japan