00468nas a2200157   4500000000100000000000100001008004100002100001400043700001600057700001600073700001600089245017300105300001100278490000700289022001400296       2012                            d1 aC. Sammon1 aA. McGrogan1 aJ. Snowball1 aC. de Vries00aFactors associated with uptake of seasonal and pandemic influenza vaccine among clinical risk groups in the UK: an analysis using the General Practice Research Database  a2483-90 v30  a0264-410x