In keeping with the guidelines of the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) Statement, I am trying to fill in their flowchart (Fig. 1) with the details of the literature search performed for my meta-analysis.
That template asks for the "# of records identified through database searching", and another one for "records identified through other sources" - however, most meta-analyses I've seen report having used multiple databases and/or search engines for the literature search, e.g. Google Scholar, PubMed, Web of Science, etc.
So how is one meant to arrive at the two numbers? Are researchers who wish to follow the PRISMA Statement meant to only decide upon one primary database, and report the number of records returned by that one database in the first box, then sum up the number of records returned by all other databases (or non-database sources such as manual perusal of reference lists) for the second box?