1 Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN, USA.
2 Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Orthopedic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA.
3 Center for Musculoskeletal Research, Vanderbilt University Medical Center, Nashville, TN, USA.
4 Department of Orthopedic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA.
5 Department of Orthopedic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA; Center for Musculoskeletal Research, Vanderbilt University Medical Center, Nashville, TN, USA.
6 Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Orthopedic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA. Electronic address: scott.zuckerman@vumc.org.