1. Division of Hygienic Chemistry, Faculty of Pharmacy, Keio University, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan
2. Department of Ophthalmology, Kanazawa Medical University, 1-1 Daigaku Uchinada-machi, Kahoku-gun, Ishikawa 920-0293, Japan
3. Laboratory of Pharmaceutical Technology, Faculty of Pharmacy, Kindai University, 3-4-1, Kowakae, Higashiosaka City, Osaka 577-8502, Japan