1. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
2. Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
3. Graduate Institute of Biomedical Science, China Medical University, Taichung, Taiwan
4. School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan