1. Vascular Biology Laboratory, St. Luke's Roosevelt Hospital Center, New York, New York
2. Department of Medicine, College of Physicians and Surgeons of Columbia University, New York, New York
3. Division of Vascular Surgery, Beth Israel Medical Center, New York, New York
4. Department of Endovascular Surgery, St. Luke's Roosevelt Hospital Center, New York, New York
5. Marmara University School of Medicine, Istanbul, Turkey
6. Department of Neurosurgery, Yale University School of Medicine, New Haven, Connecticut