Figure 1
The flowchart contains three vertical text boxes on the left, arranged from top to bottom and labeled “Identification” “Screening” and “Included”. In the Identification stage, the first text box positioned at the left reads “Records identified from asterisk: Databases (n equals 3) S C O P U S (n equals 898) J S T O R (n equals 6) Google Scholar (n equals 51)”. A right pointing arrow from this box leads to another text box labeled “Records removed before screening: Records marked as ineligible by automation tools (n equals 0) Records removed for other reasons (n equals 538)”. A downward pointing arrow leads from the first text box to the text box that reads “Records screened (n equals 417)” in the Screening stage. In the “Screening” stage, a right pointing arrow from “Records screened (n equals 417)” leads to a box labeled “Records excluded double asterisk (n equals 219)”. A downward arrow leads from “Records screened (n equals 417)” to “Reports sought for retrieval (n equals 198)”. A right pointing arrow from this box leads to a text box labeled “Reports not retrieved (n equals 219)”. A downward pointing arrow leads from “Reports sought for retrieval (n equals 198)” to “Reports assessed for eligibility (n equals 198)”. A right pointing arrow from from this box leads to a box labeled “Reports excluded: (n equals 160)”. A downward arrow leads from “Reports assessed for eligibility (n equals 198)” to the Included stage. In the “Included” stage, a last text box reads “Studies included in review (meta analyses) (n equals 38)”.Prisma flow chart for the systematic literature review