Additional file 1.

selection of studies, data-extraction and excluded studies. Table S1: in- and exclusioncriteria. Table S2: synonyms for MEDLINE and EMBASE search. Table S3: definitions of characteristics. Table S4: reason for exclusion on full-text.

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Westendorp et al. BMC Neurology 2011 11:110   doi:10.1186/1471-2377-11-110