1 From the Division of Vascular and Endovascular Surgery, Boston Medical Center, Boston University School of Medicine, MA (D.W.J.).
2 Department of Neurology, Mayo Clinic, Jacksonville, FL (T.G.B.).
3 Division of Vascular and Endovascular Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA (M.L.S.). mscherm@bidmc.harvard.edu.