[1] Thomas Jefferson University,Department of Neurosurgery
[2] Thomas Jefferson University,Department of Neurology
[3] Abington Memorial Hospital,Department of Neurology
[4] University of Pennsylvania,Department of Radiology
[5] Yale School of Medicine,Department of Neurosurgery
[6] University of Pennsylvania,Department of Neurology
[7] University of Pennsylvania,Department of Neurosurgery
[8] Westchester Medical Center,Department of Neurosurgery
[9] Hospital of the University of Pennsylvania,Division of Neurocritical Care, Department of Neurology