The duration of time since the onset of the subject's headache if it was ictal.
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Imaging ictal headache since onset duration
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The duration of time since the onset of the subject's headache if it was ictal.
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Magis D, Ambrosini A, Bendtsen L, Ertas M, Kaube H, Schoenen J; EUROHEAD Project. Evaluation and<br />proposal for optimalization of neurophysiological tests in migraine: part 1--electrophysiological tests.<br />Cephalalgia. 2007 Dec;27(12):1323-38. Review.