1. Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung, Taiwan 402
2. Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan 807
3. Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan 80756
4. School of Biomedical Engineering and Health Sciences, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia