[1] University of North Carolina at Chapel Hill,Department of Epidemiology, Gillings School of Global Public Health
[2] University of Pittsburgh,Department of Physical Therapy, School of Health and Rehabilitation Sciences
[3] Wake Forest University School of Medicine,Department of Neurology
[4] Wake Forest University,Department of Internal Medicine, School of Medicine
[5] The Cecil G. Sheps Center for Health Services Research,Department of Orthopaedic Surgery
[6] University of North Carolina at Chapel Hill,undefined
[7] School of Medicine,undefined
[8] Duke University,undefined