RT Journal Article SR Electronic T1 Children’s drawings of headache pain were accurate for diagnosing migraine JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 188 OP 188 DO 10.1136/ebm.7.6.188 VO 7 IS 6 YR 2002 UL http://ebm.bmj.com/content/7/6/188.abstract AB