1. Graduate Institute of Basic Medical Sciences, Chang Gung University, Taoyuan 333, Taiwan, Republic of China
2. School of Medical Laboratory Science and Biotechnology, China Medical University, Taichung 404, Taiwan, Republic of China
3. Department of Pharmacology, New York University School of Medicine, New York, NY 10016, USA
4. Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9110, USA
5. Graduate Institute of Natural Products, Chang Gung University, Taoyuan 333, Taiwan, Republic of China
6. Graduate Institute of Medical Biotechnology, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shen, Taoyuan 333, Taiwan, Republic of China