RT Journal Article SR Electronic T1 VASOACTIVE SUBSTANCES RELEVANT TO MIGRAINE JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 100 OP 100 DO 10.1136/jnnp.40.1.100-a VO 40 IS 1 A1 Ralph Johnson YR 1977 UL http://jnnp.bmj.com/content/40/1/100.2.abstract AB