Department of Physical Medicine & Rehabilitation,Perelman School of Medicine,University of Pennsylvania,Philadelphia,PA 19146,USA

Department of Emergency Medicine,Perelman School of Medicine,University of Pennsylvania,Philadelphia,PA 19104,USA

School of Biomedical Engineering,Science & Health Systems,Drexel University,Philadelphia,PA 19104,USA

Department of Orthopedic Surgery,Perelman School of Medicine,University of Pennsylvania,Philadelphia,PA 19104,USA

Department of Orthopedics/Sports Medicine and Joint Surgery,the First Hospital of China Medical University,Shenyang,Liaoning 110001,China

Department of Orthopedics,University of Maryland School of Medicine,Baltimore,MD 21201,USA

Section of Rehabilitation Medicine,Corporal Michael J.Crescenz Veterans Affairs Medical Center,Philadelphia,PA 19104,USA