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Holroyd K A, Cottrell C K, OâDonnell F J, Cordingley G E, Drew J B, Carlson B W et al.
Effect of preventive (β blocker) treatment, behavioural migraine management, or their combination on outcomes of optimised acute treatment in frequent migraine: randomised controlled trial
BMJ 2010; 341 :c4871
doi:10.1136/bmj.c4871