1. Department of Pathology, College of Medicine, Chung-Ang University, Seoul 156-756, Korea.
2. Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul 156-756, Korea.
3. Department of Pharmacology, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea.
4. Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul 156-756, Korea.