RT Journal Article SR Electronic T1 Evidence-free medicine JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 474 OP 475 DO 10.7861/clinmedicine.2-5-474 VO 2 IS 5 A1 Douglas Black YR 2002 UL http://www.rcpjournals.org/content/2/5/474.abstract AB