Fig. 1From: The use of UK primary care databases in health technology assessments carried out by the National Institute for health and care excellence (NICE)PRISMA flowchart for the systematic review of documents retrieved by search. The flowchart template is taken from the PRISMA website (http://prisma-statement.org/PRISMAStatement/FlowDiagram.aspx) [12]. Of the total documents retrieved, 182 were excluded as they were unrelated to TAs and a further document was excluded as this related to a TA that was withdrawn. The remaining 131 documents were grouped into 52 TAsBack to article page