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Systematic Reviews: Trial registers

A guide to assist staff and students undertaking systematic reviews

Trial registers

Many of the clinical trial registers include information about trials that are in progress as well as those that have been completed, for example:

  • CENTRAL, the Cochrane Central Register of Controlled trials
  • (a service of the U.S. National Institutes of Health)
  • ICTRP (the International Clinical Trials Registry Platform through WHO). Note that although is included in the WHO ICTRP portal, there are additional features in and hence both should be searched separately