Associate Professor of Neurology
Chief
Headache Division
Department of Neurology
Duke University Medical Center
Durham
NC
Dr Timothy Collins would like to gratefully acknowledge Dr Ann Donnelly, the previous contributor to this monograph. AD declares that she has no competing interests.
Professor
Family and Community Medicine
University of Kansas School of Medicine
Wichita
KS
Director
Walton Headache Center
Augusta
GA
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