| Sensitivity analysis | Results |
| Exclusion of trials with high risk of bias | Fancsovits 2011 excluded (OR 1.43, 95% CI 1.16 to 1.76; I2 = 44%, N = 1426) |
| Random‐effects model instead of fixed‐effect model | OR 1.34, 95% CI 1.01 to 1.79; I2 = 17%, N = 1626 |
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