1. Department of Materials Science
and Engineering, Chiao-Tung University,
Hsinchu 300, Taiwan
2. Division
of Urology, Chang Gung Memorial Hospital, Taiyuan 333, Taiwan
3. Department
of Electronics Engineering, Chang Gung University, Taoyuan 333, Taiwan
4. Department of Biological Science
and Technology, National Chiao Tung University, Hsinchu 300, Taiwan