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frequency was more than once a week in 52%, once a week in 21%, and once a month in 27%. Intensity was severe in 30%, and mild in 40%. Localization was frontal in 69% and occipital in 23%; bilateral in 48% and alternating in 22%. Headache associated symptoms in 47% included photophobia (15%), nausea (7%), and vertigo (8%). A psychogenic precipitant was recognized in 22%. A history of periodic syndrome, mainly cyclic vomiting and recurrent abdominal pain, preceded the onset of headache illnessdoi:10.15844/pedneurbriefs-10-12-10 fatcat:aquy3p6henfw5fl2uda22yh55e