1. Department of Surgery, Konyang University Hospital, Daejeon 302-718, Korea.
2. Department of Surgery, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
3. Department of Physiology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
4. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
5. Department of Pharmacology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
6. Department of Pathology, Chungnam National University School of Medicine, Daejeon 305-764, Korea.
7. Department of Pathology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
8. Department of Otolaryngology, Seoul National University, Borame Medical Center, Seoul 156-707, Korea.
9. Department of Preventing Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
10. Department of Physiology, College of Medcine, Shanghai Jiaotong University, Shanghai 200240, P.R. China.