RT Journal Article SR Electronic T1 Science and medicine 2001 JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 256 OP 257 DO 10.7861/clinmedicine.2-3-256 VO 2 IS 3 A1 Tim Chico A1 Rod Williamson YR 2002 UL http://www.rcpjournals.org/content/2/3/256.abstract AB