Figure 1.
PRISMA flow diagram. A total of 1144 articles were retrieved from the search process. After removing duplicates, 198 studies were screened at the abstract level. After removing articles (n = 131) that deviated from the objective of this study, 67 articles were reviewed at full text. 42 articles did not satisfy the inclusion criteria and were excluded from subsequent screening. Among the articles left, 13 met the inclusion criteria for the systematic review, and 12 different studies met the inclusion criteria for the meta-analysis.
