1. Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei 100, Taiwan
2. Isotope Application Division, Institute of Nuclear Energy Research, P.O. Box 3-27, Longtan, Taoyuan 325, Taiwan
3. Department of Oncology, National Taiwan University Hospital and College of Medicine, #7, Chung-Shan South Road, Taipei 100, Taiwan