RT Journal Article SR Electronic T1 Migraine and Headache Pathophysiology JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 699 OP 699 DO 10.1136/jnnp.67.5.699c VO 67 IS 5 A1 JOHN EDMEADS YR 1999 UL http://jnnp.bmj.com/content/67/5/699.4.abstract AB