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Table S1. MEDLINE (OVID) search strategy conducted 13-9-10, highlighting the six groupings of search terms.

Table S2. Risk of bias of included articles (Supporting Information for Table S1). Each category scored as Adequate (A), Inadequate (I), Not done (N) or Unclear (U).

FilenameFormatSizeDescription
obr1029_sm_tableS1.doc74KSupporting info item
obr1029_sm_tableS2.doc256KSupporting info item

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