RT Journal Article SR Electronic T1 Diagnosing acute headache JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 288 OP 288 DO 10.7861/clinmedicine.4-3-288a VO 4 IS 3 A1 Maisse Farhan A1 Jonathan Hutt YR 2004 UL http://www.rcpjournals.org/content/4/3/288.2.abstract AB