1. Department of Urology, School of Medicine, and Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Korea.
2. Department of Pharmacology, School of Medicine, and Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Korea.
3. College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea.
4. Division of Biosciences, Dongguk University, Gyeongju 780-714, Korea.