| 1 | Title/abstract screening | Classify which papers should advance to full-text review. | |
| 2 | Full-text screening | Classify whether each complete paper is eligible. | |
| 3 | | Extract the study data needed for the analysis. | |
| 4 | Risk of Bias | Judge which study methods could distort the findings. | |
| 5 | Meta-analysis | Combine the staged study results correctly. | |