In Reply. —We appreciate the comments from Vijayan and from Spierings and Graham to our recent article in the Archives.1 They rightly point to the possible importance of arterial mechanisms, in particular outside of the brain, for pain production during migraine attacks. The earlier conclusions by Wolff's group were based on methodology that today must be regarded as unreliable and due consideration was not given to control groups and statistical evaluation. While the potential for study of cerebral blood flow has greatly increased over recent years, the same, unfortunately, is not true of our possibilities to study arterial diameter and pulsations intracranially and extracranially. Our study has ruled out certain pain mechanisms, but not the possibility that pain is due to abnormalities in and around arteries. This is a topic for future research and the problems may possibly be dealt with by newly developed ultrasound equipment. It might be worthwhile to
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
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