1. Johns Hopkins University,Department of Computer Science,Baltimore,MD,USA,21218
2. Johns Hopkins University,Department of Mechanical Engineering,Baltimore,MD,USA,21218
3. Johns Hopkins University,Department of Neurology, and Department of Neuroscience,Baltimore,MD,USA,21218
4. Johns Hopkins University,Applied Physics Laboratory,Department of Mechanical Engineering, Department of Computer Science, Department of Orthopaedic Surgery,Baltimore,MD,USA,21218