Cochrane Library is composed of the Cochrane Database of Systematic Reviews, the leading resource for systematic reviews in health care. It includes peer reviewed systematic reviews and protocols prepared according to the Cochrane Handbook for Systematic Reviews of Interventions or Cochrane Handbook for Diagnostic Test Accuracy Reviews and editorials and supplements. The resource is updated often, with reviews and protocols being published when ready. Cochrane Library also includes the Cochrane Central Register of Controlled Trials and published monthly. The Cochrane Library offers Cochrane Clinical Answers, which provide a clinically-focused entry point to research from Cochrane Reviews. Also included are special collections of evidence-based guides related to diagnosing common medical conditions. The federated search feature allows Cochrane Library users to search systematic reviews from McMaster Health Forum's repositories: Health Systems Evidence and Social Systems Evidence.