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Have you ever taken prescription medication for headache on a daily basis, whether or not you have a headache, to help prevent a severe headache from happening in the first place [PhenX]

Have you ever taken prescription medication for headache on a daily basis, whether or not you have a headache, to help prevent a severe headache from happening in the first place, a finding in the patient by PhenX, an ordinal result. PhenX measures.