00448nas a2200169   4500000000100000000000100001008004100002100001300043700001700056700001400073700001500087700001300102245011300115300001100228490000700239022003200246       2005                            d1 aP. Helms1 aEkins Daukes1 aM. Taylor1 aC. Simpson1 aJ. McLay00aUtility of routinely acquired primary care data for paediatric disease epidemiology and pharmacoepidemiology  a684-900 v59  a0306-5251 (Print) 0306-5251