RT Journal Article SR Electronic T1 A historical perspective on placebo JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 9 OP 10 DO 10.7861/clinmedicine.8-1-9 VO 8 IS 1 A1 Edzard Ernst YR 2008 UL http://www.rcpjournals.org/content/8/1/9.abstract AB