1. Graduate Institute of Biomedical Sciences, China Medical University, Taichung 404, Taiwan
2. Materials & Electro-Optics Research Division, National Chung-Shan Institute of Science & Technology, Taoyuan City 407, Taiwan
3. Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei 112, Taiwan
4. School of Dentistry, College of Dentistry, China Medical University, Taichung 404, Taiwan
5. Department of Bioinformatics and Medical Engineering, Asia University, Taichung 413, Taiwan