Figure 2
The diagram is structured vertically into four main phases: “Identification,” “Screening,” “Eligibility,” and “Included.” In the “Identification” phase, a text box is labeled “Articles identified through database searching: n equals 8179.” An arrow points rightward to a text box labeled “Duplicates removed: n equals 1410.” In the “Screening” phase, the main text box is labeled “Articles after duplicates removed: n equals 6769.” An arrow points downward to a text box labeled “Articles screened for titles or abstracts: n equals 6769.” An arrow points rightward to a text box labeled “Articles excluded based on title or abstracts: n equals 6688.” In the “Eligibility” phase, a text box is labeled “Full-text articles reviewed: n equals 81.” An arrow points rightward to another text box labeled “Articles excluded based on full-text review (n equals 44).” This box contains the following details: “16 multiple reasons, 9 out-of-scope outcomes or did not specify outcomes, 7 out-of-scope interventions or did not examine interventions (for example, board diversity as an intervention), 7 out-of-scope setting (for example, pre-vocational training), 4 not a review paper, 1 out-of-scope population (for example, focused exclusively on China, Singapore, Thailand, Hong Kong, and Taiwan).” In the “Included” phase, the final text box is labeled “Final articles included: n equals 37.” Arrows lead downward from the top text box in the “Identification” phase to the bottom text box in the “Included” stage.PRISMA diagram presenting the flow of articles through the review process