RT Journal Article SR Electronic T1 Letters to the Editor JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 524 OP 525 DO 10.7861/clinmedicine.7-5-524a VO 7 IS 5 A1 John Warren YR 2007 UL http://www.rcpjournals.org/content/7/5/524.2.abstract AB