RT Journal Article SR Electronic T1 Why illness perceptions matter JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 536 OP 539 DO 10.7861/clinmedicine.6-6-536 VO 6 IS 6 A1 Keith Petrie A1 John Weinman YR 2006 UL http://www.rcpjournals.org/content/6/6/536.abstract AB