RT Journal Article SR Electronic T1 Risk of ischaemic stroke in people with migraine: systematic review and meta-analysis of observational studies JF BMJ JO BMJ FD British Medical Journal Publishing Group SP 345 DO 10.1136/bmj.330.7487.345-b VO 330 IS 7487 YR 2005 UL http://www.bmj.com/content/330/7487/345.3.abstract AB