1. Beijing Tiantan Hospital, Capital Medical University, Beijing Tiantan Xili 6, Beijing 100050, China
2. Department of Physical and Rehabilitation Medicine, Ghent University Hospital, 9000 Ghent, Belgium
3. Department of Rehabilitation Sciences and Physiotherapy, Ghent University, 9000 Ghent, Belgium
4. Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, 9000 Ghent, Belgium