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Inclusion Criteria and Data Extraction.
| Inclusion | Exclusion |
|---|---|
| African population | Studies in non-African countries |
| Published from 1984 to 2020 | Studies conducted before 1983 |
| Human studies | Non-human studies |
| Studies investigating an association (p < 0.05) between SNP and hypertension. | Studies in gene expression |
| Case-control design | Reviews |
| Family-based studies |
