Guidance on terminology, application, and reporting of citation searching: the TARCiS statement

Evidence syntheses adhering to systematic literature searching techniques are a cornerstone of evidence based healthcare. Beyond term based searching in electronic databases, citation searching is a prevalent search technique to identify relevant sources of evidence. However, for decades, citation searching methodology and terminology has not been standardised. An evidence guided, four round Delphi consensus study was conducted with 27 international methodological experts in order to develop the Terminology, Application, and Reporting of Citation Searching (TARCiS) statement. TARCiS comprises 10 specific recommendations, each with a rationale and explanation on when and how to conduct and report citation searching in the context of systematic literature searches. The statement also presents four research priorities, and it is hoped that systematic review teams are encouraged to incorporate TARCiS into standardised workflows.