title: Meta-analysis - a valuable but easily misused tool.
authors: L S
authors: LS
authors: Rasmussen
authors: J B
authors: JB
authors: Dahl
mesh_terms: D006801:Humans; D015201:Meta-Analysis as Topic; D020250:Postoperative Nausea and Vomiting / Q000517:prevention & control; D018570:Risk Assessment