1. Robotics Institute; Beihang University; Beijing P.R. China
2. Department of Orthopaedics and Traumatology, Faculty of Medicine; the Chinese University of Hong Kong; Hongkong SAR P.R. China
3. Prince of Wales Hospital; Shatin Hong Kong SAR P.R. China
4. School of Biological Science and Medical Engineering; Beihang University; Beijing P.R. China