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*Dr. Kathleen Digre (recipient of a Heed Foundation Fellowship), is a Fellow in the Departments of Ophthalmology and Neurology at University of Iowa College of Medicine †Dr. H. Damasio is a Professor of Neurology and Director of the Migraine Clinic of the Department of Neurology Department of Neurology, University of Iowa College of Medicine, Iowa City, Iowa
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Digre et al. (1987) studied this question.
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