| CI | Confidence Interval |
| IV | Instrumental Variable |
| MD | Mean Differences |
| PRISMA | Preferred Reporting Items of Systematic Review and Meta-Analysis Guidelines |
| SF | Serum Ferritin |
| sTfR | Soluble Transferrin Receptor Concentration |
| TIBC | Total Iron Binding Capacity |
| TSAT | Transferrin Saturation |
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