1. Department of Ophthalmology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu-shi, Gifu 500-1194, Japan
2. Department of Ophthalmology, Toho University Ohashi Medical Center, 2-17-6, Ohashi, Meguro-ku, Tokyo 153-8515, Japan
3. Murase Eye Clinic, 17-1 Hanaike, Hagiwaracho, Gero-shi, Gifu 509-2515, Japan
4. Department of Infection Control and Prevention, Aichi Medical University, 1-1 Karimata, Iwasaku, Nagakute-shi, Aichi 480-1195, Japan