1. Nursing Department, Buddhist Tzu Chi College of Technology, Hualien, Taiwan
2. Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan
3. Department of Biomedical Engineering, I-Shou University, Kaohsiung, Taiwan
4. Department of Electrical Engineering, College of Electrical Engineering and Computer, Engineering, National Taiwan University, Taipei, Taiwan