1. Department of Orthopedic Surgery, 1st Affiliated Hospital of Soochow University, Suzhou 215005, China
2. Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612, USA
3. Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA 19107, USA
4. Department of Bioengineering, University of Illinois Chicago, Chicago, IL 60612, USA