1. Tianjin Key Laboratory of Intelligent Robotics, Institute of Robotics and Automatic Information System, College of Artificial Intelligence, Nankai University, Tianjin, China
2. Department of Orthopedic Surgery, Tianjin Medical University General Hospital, Tianjin, China
3. Key Lab for Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, China