Figure 2
The figure depicts four text boxes arranged in a vertical series on the left. From top to bottom, the text boxes are labeled as follows: “Identification”, “Screening”, “Eligibility”, and “Included”. In the “Identification” stage, the first text box lists “Records identified using search terms since the year 2005 (n equals 700), Records identified through database searching (n equals 678), Records identified through other sources (n equals 22)”. A rightward arrow points from the first text box to the second text box positioned directly to the right at the same stage and level, reading “Records removed before screening: Duplicate records removed (n equals 167)”. A downward arrow points from the first text box to the third text box positioned directly below in the “Screening” stage, labeled “Records screened (n equals 533)”. A rightward arrow points from the third text box to the fourth text box positioned directly on the right at the same stage and level, labeled “Records excluded (n equals 398)”. A downward arrow points from the third text box to the fifth text box positioned directly below at the same stage, labeled “Records sought for retrieval (n equals 135)”. A rightward arrow points from the fifth text box to the sixth text box positioned directly on the right at the same stage and level, labeled “Records not retrieved (n equals 0)”. A downward arrow points from the fifth text box to the seventh text box positioned directly below at the “Eligibility” stage, labeled “Records assessed for eligibility (n equals 135)”. A rightward arrow points from the seventh text box to the eighth text box positioned directly on the right at the same stage and level, labeled “Records excluded, deemed outside scope (n equals 93)”. A downward arrow points from the seventh text box to the ninth text box positioned directly below in the “Included” stage, labeled “Reports included in literature review (n equals 42)”.PRISMA flowchart