1. Department of Medical Biochemistry and Global COE, University of Shizuoka Graduate School of Pharmaceutical Sciences, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
2. Department of Life and Materials Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
3. Nippon Fine Chemical Co. Ltd., 5-1-1 Umei, Takasago, Hyogo 676-0074, Japan
4. DDS Research, Formulation Research Laboratories, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba, 300-2635, Japan