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Biology, 22.04.2020 02:08 aahneise02
Adults with more than a 12-month history of migraines were assigned randomly in a double-blinded study to receive treatment with experimental drug X (10 or 20 mg/day) or placebo. The primary efficacy measure was the reduction in severity of the migraine attacks. Enrollment was 1,200 subjects. Which of the following best describes the clinical phase of this study?
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