The authors wish to make the following correction to their paper [1].
In the Materials and Method Section, “All stockworkers completed a full training day in the CPK, provided and audited by the HSA in November 2012, and all were deemed competent by the HSA representative” should read as “All stockworkers completed a full training day in the CPK, provided by the HSA in October and November 2012.”
The authors would like to apologize for any inconvenience caused. The change does not affect the scientific results. The manuscript will be updated and the original will remain online on the article webpage.
Reference
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