1. Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
2. Bioinspired Engineering and Biomechanics Center (BEBC), Xi'an Jiaotong University, Xi'an, P.R. China.
3. The Key Library of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, P.R. China.