[1] Osaka Daigaku, Daigakuin Igakukei Kenkyuka Igakubu, Dept Ophthalmol, Suita, Osaka, Japan
[2] Tokyo Shika Daigaku, Ichikawa Sogo Byoin, Dept Ophthalmol, Ichikawa, Chiba, Japan
[3] Osaka Daigaku, Daigakuin Igakukei Kenkyuka Igakubu, Dept Social Med, Div Publ Hlth, Suita, Osaka, Japan