1. College of Pharmacy & Kyunghee East-west Pharmaceutical Research Institute; Kyung Hee University; Seoul 130-701 Republic of Korea
2. Korea Research Institute of Standards and Science; Daejeon 305-806 Republic of Korea
3. Korea Basic Science Institute; Seoul 136-713 & Daejeon 305-340 Republic of Korea
4. College of Pharmacy; Pusan National University; Busan 609-735 Republic of Korea