1. Department of Science, Mathematics and Technology, Singapore University of Technology and Design, Singapore 487372, Singapore
2. Department of Electronic Engineering, Chang Gung University, Guishan Dist., 33302 Taoyan, Taiwan
3. Department of Electronic Engineering, Ming Chi University of Technology, Taishan Dist., 24301 New Taipei City, Taiwan
4. Department of Neurosurgery, Chang Gung Memorial Hospital, Linkou, Guishan Dist., 33305 Taoyuan, Taiwan