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After publication of the original article , it came to the authors’ attention that there was an error affecting the References. The published Reference 14  is incorrect, and should have cited a different article by Pate et al. .
Pate et al.  should have been included in the Reference list as 14, and the subsequent references (and citations within the article text) should have been renumbered.
The online version of the original article can be found under doi:10.1186/s12874-017-0295-7.