1. Department of Dental Pharmacology; School of Dentistry and Institute of Oral Bioscience, BK21 Plus, Chonbuk National University; Jeonju 651-756 Korea
2. Department of Pharmacy; College of Pharmacy and Natural Medicine Research Institute, Mokpo National University; Jeonnam 534-729 Korea
3. The China-US (Henan) Hormel Cancer Institute; Zhengzhou Henan China