Additional file 1.

MOOSE Checklist. The MOOSE (Meta-analysis Of Observational Studies in Epidemiology) checklist is recommended to report on meta-analyses of observational studies and aims to ensure sufficient information about background, search strategy, methods, results, discussion, and conclusion.

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Meier et al. BMC Medicine 2012 10:62   doi:10.1186/1741-7015-10-62