Table 5

Template—summary table for yield

DatabaseInitial yieldAfter level 1 screeningAfter level 2 screening
Bibliographic databases
 DB 1—Engineering Village
 DB 2—Web of Science
 DB 3—CINAHL
 DB 4—MEDLINE
 DB 5—HealthStar
  Total
  Duplicates removed
  Number of references from databases
Manual Identification
 Google Scholar
  Number from Google Scholar removed after initial scan
  Duplicates of bibliographic databases removed
  Number of references from Google Scholar for screening
  Manual search of reference lists
  Number from manual search of reference lists
  Duplicates of bibliographic databases and Google Scholar removed
  Number of references from reference lists for screening
Grand total