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In this research article by Sven Trelle and colleagues (BMJ 2007;334:354-7; doi: 10.1136/bmj.39079.460741.7C) two errors were missed in the full version (on bmj.com). The absolute risk ratio if 10% of patients managed with simple patient referral had persistent or recurrent infections would be 2.7% [not 3.7%] and the number needed to treat 37 [not 27].
