1. Faculty of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan
2. Institute of Biochemistry, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
3. Department of Life Science, National Taitung University, Taitung 950, Taiwan
4. Department of Urology, College of Medicine, National Taiwan University, Taipei 100, Taiwan