1. Department of Biomedical Engineering, Chung Yuan Christian University, Chung-Li 320314, Taiwan
2. Division of Nephrology, Department of Internal Medicine, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan 115204, Taiwan
3. Department of Electrical Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan
4. Department of Information Systems and Computer Science, Ateneo de Manila University, Quezon City 1108, Philippines
5. Department of Electronic Engineering, Chung Yuan Christian University, Taoyuan City 320314, Taiwan