The authors regret that an error occurred in Table 6 of the above paper. The ARR for Kampman et al (2012) was displayed as 5.02 with a NNT of 19.91; however, it should have been an ARR of −5.02 with a NNTH (i.e. NNT with a negative outcome or harm) of 19.91.
This does not change any of the other conclusions or analyses in the paper.
The authors would like to apologise for any inconvenience caused.
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Published online: July 18, 2014
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© 2014 Elsevier B.V. Published by Elsevier Inc. All rights reserved.
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