1 Department of Orthopedic Surgery, Vanderbilt University Medical Center, Vanderbilt Health One Hundred Oaks 719 Thompson Lane, Suite 23108, Nashville, TN 37204-7900, USA.
2 Department of Neurological Surgery, Vanderbilt University Medical Center, Vanderbilt Health One Hundred Oaks 719 Thompson Lane, Suite 23108, Nashville, TN 37204-7900, USA.