1 1Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, Pennsylvania.
2 2Atrium Health Neuroscience Institute, Atrium Health Musculoskeletal Institute, and Carolina Neurosurgery and Spine Associates, Charlotte, North Carolina.
3 3Department of Neurological Surgery, Atlantic Neurosurgical Specialists, Morristown, New Jersey; and.
4 4Neurosurgery, Wessex Neurological Centre, Birmingham Children's Hospital, Birmingham, United Kingdom.