1 NeuroEndovascular Program, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
2 Departments of Radiology and Neurological Surgery, Neurological Institute of New York, Columbia University, College of Physicians & Surgeons, New York, New York, USA.
3 Hackensack University Medical Center, Hackensack, New Jersey, USA.
4 Pain Management Center of Paducah, Paducah, Kentucky, USA.
5 Department of Anesthesiology and Perioperative Medicine, University of Louisville, Louisville, Kentucky, USA.