1. Japan Tobacco Inc., Central Pharmaceutical Research Institute, Toxicology Research Laboratories, 23 Naganuki, Hadano, Kanagawa 257-0024, Japan
2. Japan Tobacco Inc., Central Pharmaceutical Research Institute, Biological/Pharmacological Research Laboratories, Osaka 569-1125, Japan
3. Department of Ophthalmology, Saitama Medical Center, Jichi Medical University, Saitama 330-8503, Japan