1. Research and Development Department, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo 174-8555, Japan
2. Department of Ophthalmology, Yokohama City University School of Medicine, Kanazawa-ku, Yokohama, Kanagawa 236-0004, Japan
3. Department of Ophthalmology and Visual Sciences, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
4. Suzuki Pediatric Clinic, Ube, Yamaguchi 755-0151, Japan