Additional file 3.

All excluded studies.

    Table (iii)a
List of studies excluded on examination of full text (or abstract only from proceedings papers) with reason for exclusion. Proceedings papers (P)
    Table (iii)b
List of studies excluded on the basis of title and/or abstract from initial database searches (Medline, EMBASE and first 250 hits from Pubmed only).

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Carr et al. BMC Neurology 2010 10:46   doi:10.1186/1471-2377-10-46