1. Department of Neurological Surgery, Division of Neurovascular Surgery and Endovascular Neurosurgery, Thomas Jefferson University Hospital, 901 Walnut Street, Philadelphia, PA 19107, USA
2. Department of Neurological Sciences, Division of Neurocritical Care, Thomas Jefferson University Hospital, Philadelphia, PA, USA
3. Department of Neurosurgery, University of Virginia, Charlottesville, VA, USA