1. Georgia Institute of Technology,George W. Woodruff School of Mechanical Engineering,Atlanta,GA,USA,30332-0405
2. Emory University and Georgia Institute of Technology,W. H. Coulter Department of Biomedical Engineering,Atlanta,GA,USA,30332-4250
3. Emory University,W. H. Coulter Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, and Department of Rehabilitation Medicine, Division of Physical Therapy,Atlanta,GA,USA,30332-4250