PRISMA 흐름도
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PRISMA 흐름도
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Exclusion of literature: non-empirical research No grades or operational evaluations Effectvalues cannot be calculated from data in literature without control group
Literature searched in databaseN = 2038
N = 26literatures included in meta-analysis
Identification
Exclusion of literature:No resultsin non-empirical researchorirrelevant operational evaluation topics
Screening
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