case_images: PMC5729833_01
case_images: PRISMA flow chart.
case_images: prbm-10-387Fig1.jpg
case_images: PMC5729833_01_prbm-10-387Fig1.jpg
case_images: f1-prbm-10-387
case_images: The PRISMA (Preferred Reporting Items for Systematic Review and Meta-Analyses) flowchart of the search is shown in Figure 1.