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Disclaimer: Supplementary materials have been peer-reviewed but not copyedited.

FilenameFormatSizeDescription
jmwh12085-sup-0001-TableS1.doc69KTable S1: PRISMA 2009 Checklist.
jmwh12085-sup-0002-SupMat.doc28KAppendix S1: Newcastle - Ottawa quality assessment scale: Case control studies.
jmwh12085-sup-0003-SupMat.doc29KAppendix S2: Coding manual for case-control studies.

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