1. Department of Infectious Diseases, Institute of Medical Science; The University of Tokyo; Minato-ku Tokyo 108-8639 Japan
2. Department of Ophthalmology; International Medical Center of Japan; Shinjuku-ku Tokyo 162-855 Japan
3. Department of Laboratory Medicine, Institute of Medical Science; The University of Tokyo; Minato-ku Tokyo 108-8639 Japan
4. Department of Ophthalmology; Tokyo Koseinenkin Hospital; Shinjuku-ku Tokyo 162-8543 Japan
5. Department of Ophthalmology, School of Medicine; Tokyo Medical and Dental University; Bunkyo-ku Tokyo 113-8510 Japan
6. Infectious Diseases and Applied Immunology, Institute of Medical Science; The University of Tokyo; Minato-ku Tokyo 108-8639 Japan