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• The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2288/13/131/prepub

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1. We used the Cochrane Database of Systematic Reviews issue 3/ 2013 (Gehanno et al. used Issue 3/2009 [9]).
2. *: “References included“ is the number of single references of included studies with one major reference per study as retrieved from the Cochrane reviews.