title: Systematic overview of controlled trials (meta-analysis) helps clarify treatment effects.
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D006801:Humans; D008274:Magnesium / Q000008:administration & dosage; D015201:Meta-Analysis as Topic; D009203:Myocardial Infarction / Q000188:drug therapy / Q000401:mortality
chemical_list: D008274:Magnesium