1. Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
2. Biomechanics and Biotechnology Laboratory, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China
3. Institute of Orthopaedics and Musculoskeletal Science, University College London, Royal National Orthopaedic Hospital, London HA7 4LP, UK