1. Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu, Taiwan
2. Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
3. Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, Taiwan
4. Department of Orthopaedic Surgery, Spine Section, Chang Gung Memorial Hospital, Taoyuan, Taiwan