PubMed:: "Placebo Effect"[Mesh:NoExp] OR placebo effect*[tiab] OR placebo reaction*[tiab] OR placebo response*[tiab];; Embase.com:: 'placebo effect'/exp OR 'placebo effect*':ab,ti OR 'placebo reaction*':ab,ti OR 'placebo response*':ab,ti;; Cochrane Library:: "placebo effect*":ti,ab,kw or "placebo reaction*":ti,ab,kw or "placebo response*":ti,ab,kw;; CINAHL:: (MH "Placebo Effect") OR TI ("placebo effect*" OR "placebo reaction*" OR "placebo response*") OR AB ("placebo effect*" OR "placebo reaction*" OR "placebo response*");; PsycInfo:: TI ("placebo effect*" OR "placebo reaction*" OR "placebo response*") OR AB ("placebo effect*" OR "placebo reaction*" OR "placebo response*")
