1. Research Institute of Pharmaceutical SciencesDepartment of PharmacyCollege of PharmacySeoul National UniversitySeoul151‐742 Korea
2. Medicinal Bioconvergence Research CenterSeoul National UniversitySeoul151‐742 Korea
3. Department of PharmacyCollege of PharmacyChung‐Ang UniversitySeoul156‐756 Korea