1. Innovation Center of Bioengineering, Shaanxi Engineering Laboratory for Transmissions and Controls, Northwestern Polytechnical University, Xi'an, P.R. China
2. Joint Surgery Department, Xi’an Hong-hui Hospital, Xi’an Jiaotong University College of Medicine, Xi’an, P.R. China
3. Department of Industrial Design, School of Art and Design, Xi’an University of Technology, Xi’an, P.R. China