1. Faculty of Electrical and Electronic Engineering, University Tun Hussein Onn Malaysia, Batu Pahat, Johor, Malaysia
2. Faculty of Mechanical Engineering, Universiti Teknologi Mara, Shah Alam, Malaysia
3. Research Institute for Applied Mechanics, Kyushu University, Japan
4. Division of Spine Surgery, Department of Orthopedic Surgery, School of Medicine, Juntendo University, Tokyo, Japan