Figure 2
The flowchart is divided into three stages, labeled on the left, from top to bottom as “Identified,” “Screened,” and “Included.” Each stage is further divided into two sections labeled at the top from left to right as “Identification of studies via databases” and “Identification of studies via other methods.” The “Identification of studies via databases” side begins with the first box in the “Identified” section labeled “1st search, Records identified from four Databases (n equals 522).” A rightward arrow from the first box leads to the second box in the same section, labeled “Records removed before screening: Duplicate records removed (n equals 190).” A downward arrow from the first box leads to the third box in the “Screened” section labeled “Records screened (type, date, title and abstract) (n equals 332).” A rightward arrow from the third box leads to the fourth box in the same section, labeled “Records excluded asterisk: Outdated (n equals 66), Wrong type (n equals 68), Irrelevant (n equals 82).” A downward arrow from the third box leads to the fifth box in the same section, labeled “Studies assessed for eligibility (full text and quality) (n equals 116).” A rightward arrow from the fifth box leads to the sixth box in the same section, labeled “Studies excluded: Poor quality (n equals 7), Irrelevant (n equals 56).” A downward arrow from the fifth box leads to the seventh box in the “Included” section, labeled “(n equals 53) studies included from database search.” An upward arrow from the seventh box, “(n equals 53),” leads upward to the “Identification of studies via other methods” section. In this section, the first box in the “Identified” section is labeled “2nd search, (‘Cited by’ in Google Scholar) of n equals 47 included studies. Records identified (n equals 812).” A downward arrow from the first box leads to the second box in the “Screened” section, labeled “Records screened (type, date, title and abstract) (n equals 812).” A rightward arrow from the second box leads to the third box in the same section, labeled “Records excluded asterisk: Wrong type (n equals 174), Outdated (n equals 0), Irrelevant (n equals 625).” A downward arrow from the second box leads to the fourth box in the same section, labeled “Studies assessed for eligibility (full text and quality) (n equals 13).” A rightward arrow from the fourth box leads to the fifth box in the same section, labeled “Studies excluded: Poor quality (n equals 0), Irrelevant (n equals 3).” A downward arrow from the fourth box leads to the sixth box in the “Included” section, labeled “(n equals 10) studies included from ‘cited by’ search.” The seventh box, “(n equals 53) studies included from database search,” from the left “Identification of studies via databases” section, and the sixth box, “(n equals 10) studies included from ‘cited by’ search,” from right “Identification of studies via other methods” section, merge to the last box of the flowchart in the “Included” section, labeled, ” TOTAL number of studies included in the review (n equals 63); Studies used to answer R q 1 (n equals 53), Studies used to answer R q 2 (n equals 14)”.Paper selection process according to the PRISMA method. Note: * refers to inclusion/exclusion criteria (Table 1). Source: PRISMA flow diagram adapted from Page et al. (2021)