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The authors regret that the following 95% confidence intervals were printed incorrectly in the original version:
Abstract (p. 65)
Error: OR 0.11, 95% confidence interval 0.20–0.61
Correct: OR 0.11, 95% confidence interval 0.02–0.61
Results (p. 70)
Error: (OR 0.11, 95% CI 0.20–0.61)
Correct: (OR 0.11, 95% CI 0.02–0.61)
Supplementary material Table S4
Error: 0.11 (0.20–0.61)
Correct: 0.11 (0.02–0.61)
The authors wish to apologise for any inconvenience caused.
