[1] Univ Texas Med Branch, John Sealy Sch Med, 301 Univ Blvd, Galveston, TX 77555 USA
[2] Univ Texas Med Branch, Dept Neurosurg, 1005 Harborside Dr, 5th Floor, Galveston, TX 77555 USA
[3] Univ Texas Med Branch, Dept Biostat & Data Sci, 700 Harborside Dr, Ewing Hall 1-134, Galveston, TX 77555 USA
[4] Univ Texas Med Branch, Dept Orthopaed Surg & Rehabil, 301 Univ Blvd, Route 0165, Galveston, TX 77555 USA