| Studies | Year | Incidence in cases (%) | Incidence in control (%) | Relative risk (CI) | p value |
|---|---|---|---|---|---|
| VIP [2] | 2006 | 15 | 16 | 0.97 (0.80–1.17) | >0.05 |
| Beazley [3] | 2003 | 17.3 | 18.8 | 0.92 (0.40–2.13) | >0.05 |
| Chapell [4] | 1997 | 8 | 17 | 0.46 (0.24–0.91) | <0.05 |
| Sharma [5] | 2003 | 2.9 | 6 | 0.48 (0.24–0.97) | <0.05 |
| RIVAS [5] | 2000 | 1.2 | 16.6 | 0.07 (0.01–0.54) | <0.05 |
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