1. Department of Obstetrics and Gynecology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
2. Department of Pathology, 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 Physiology, Nagoya City University Medical School, Nagoya 467-8601, Japan.
5. Department of Pharmacology, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
6. Department of Urology, College of Medicine, Chung-Ang University, Seoul 156-756, Korea.
7. Department of Physiology, College of Medicine, Chung-Ang University, Seoul 156-756, Korea.
8. Department of Physiology, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea.
9. Department of Anesthesiology and Pain Medicine, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
10. Department of Surgery, Chungbuk National University College of Medicine, Cheongju 361-763, Korea.
11. Department of Physiology, Shanghai Jiaotong University School of Medicine, Shanghai 200240, China.