1. Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville;
2. Surgical Outcomes Center for Kids, Monroe Carell Jr. Children’s Hospital at Vanderbilt, Nashville, Tennessee;
3. Department of Neurosurgery, University of Washington, Seattle, Washington;
4. Department of Biostatistics, Vanderbilt University Medical Center, Nashville;
5. Department of Pediatric Surgery, Monroe Carell Jr. Children’s Hospital at Vanderbilt, Nashville; and
6. Department of Pediatrics, Division of Emergency Medicine, Monroe Carell Jr. Children’s Hospital at Vanderbilt, Nashville, Tennessee