1. Neuroendovascular Program, Departments of Radiology, Neurosurgery and Neurology, Massachusetts General Hospital, Harvard Medical School, Boston,Massachusetts, USA;
2. Neurovascular Centre, Departments of Medical Imaging & Neurosurgery, St. Michael's Hospital, University of Toronto, Toronto, Ontario, USA;
3. Department of Neurosurgery, National Neuroscience Institute, King Fahad Medical City, Riyadh, Saudi Arabia;
4. Departments of Neurology and Rehabilitation Medicine, University of Cincinnati, Cincinnati, Ohio, USA;
5. Department of Neurosurgery, University of Florida, Gainesville, Florida, USA;
6. Department of Radiology, University of Vermont Medical Center, Burlington, Vermont, USA;
7. Department of Neurosurgery, University of Texas Health Science Center at San Antonio, Long School of Medicine, San Antonio, Texas, USA;
8. Department of Neurosurgery, University of Colorado, Denver, Colorado, USA;
9. Departments of Neurosurgery and Neurology, Westchester Medical Center, Valhalla, New York, USA;
10. Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut, USA;
11. Departments of Radiology & Neurosurgery, Hospital Universitario San Ignacio, Bogotá, Colombia;
12. Department of Radiology & Neurosurgery, University of Pennsylvania School of Medicine, Pennsylvania, Pennsylvania, USA;
13. Department of Neurosurgery, State University of New York at Buffalo, Buffalo, New York, USA;
14. Department of Neurosurgery, Thomas Jefferson University, Philadelphia, Pennsylvania, USA;
15. Department of Neurointerventional Radiology, UMass Memorial Hospital, Worcester, Massachusetts, USA