1. Institute of Traditional Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
2. Division of Urology, Department of Surgery, Taipei City Hospital Renai Branch, Taipei 106, Taiwan
3. Department of Urology, School of Medicine, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
4. Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
5. Department of Psychology, University of Cambridge, Cambridge CB2 3EB, United Kingdom