1. Department of Ophthalmology, Kindai University Faculty of Medicine, Osakasayama, Osaka 589‑8511, Japan
2. Department of Microbiology, Faculty of Medicine, Kagawa University, Miki, Kagawa 761‑0793, Japan
3. Department of Ophthalmology, Fuchu Eye Center, Izumi, Osaka 594‑0076, Japan