title: Systematic Reviews Published in Emergency Medicine Journals Do Not Routinely Search Clinical Trials Registries: A Cross-Sectional Analysis.
abstract: OBJECTIVE
  Publication bias compromises the validity of systematic reviews. This problem can be addressed in part through searching clinical trials registries to identify unpublished studies. This study aims to determine how often systematic reviews published in emergency medicine journals include clinical trials registry searches.
  
  
  METHODS
  We identified all systematic reviews published in the 6 highest-impact emergency medicine journals between January 1 and December 31, 2013. Systematic reviews that assessed the effects of an intervention were further examined to determine whether the authors described searching a clinical trials registry and whether this search identified relevant unpublished studies.
  
  
  RESULTS
  Of 191 articles identified through PubMed search, 80 were confirmed to be systematic reviews. Our sample consisted of 41 systematic reviews that assessed a specific intervention. Eight of these 41 (20%) searched a clinical trials registry. For 4 of these 8 reviews, the registry search identified at least 1 relevant unpublished study.
  
  
  CONCLUSIONS
  Systematic reviews published in emergency medicine journals do not routinely include searches of clinical trials registries. By helping authors identify unpublished trial data, the addition of registry searches may improve the validity of systematic reviews.
authors.affiliation: School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC.
authors.forename: Lukas G
authors.initials: LG
authors.lastname: Keil
authors.affiliation: Department of Emergency Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC.
authors.forename: Timothy F
authors.initials: TF
authors.lastname: Platts-Mills
authors.affiliation: Department of Emergency Medicine, Cooper Medical School of Rowan University, Camden, NJ. Electronic address: cjones.unc@gmail.com.
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Jones
mesh_terms: D002986:Clinical Trials as Topic; D003430:Cross-Sectional Studies; D004635:Emergency Medicine; D006801:Humans; D055811:Journal Impact Factor; D010506:Periodicals as Topic; D012042:Registries; D012196:Review Literature as Topic