206 Chapter 8 Risk of bias for all the studies identified through scientific databases was assessed independently by two reviewers using the National Institutes of Health Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies [9]. Figure 1. Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) flow diagram of identification and selection process of studies
RkJQdWJsaXNoZXIy MTk4NDMw