1. Department of Surgery, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
2. Department of Physiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
3. Department of Pharmacology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
4. Department of Pathology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
5. Department of Preventing Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
6. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
7. Department of Physiology, College of Medcine, Shanghai Jiaotong University, Shanghai 200240, China.