Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF ++ Sait Ashina, MD ++ Assistant Professor of Neurology and Anesthesia ++ BIDMC Comprehensive Headache Center ++ Department of Neurology and Department of Anesthesia ++ Critical Care and Pain Medicine ++ Harvard Medical School ++ Beth Israel Deaconess Medical Center ++ Boston, Massachusetts