1. College of Pharmacy, Korea University, Sejong 339-700, Korea.
2. Bioevaluation Center, KRIBB, Ochang 363-883, Korea.
3. College of Pharmacy, Chungbuk National University, Cheongju 362-763, Korea.
4. College of Pharmacy, Chungnam National University, Daejeon 305-764, Korea.
5. Research Driven Hospital, Korea University Guro Hospital, Biomedical Research Center, Seoul 152-703, Korea.