00545nas a2200181   4500000000100000000000100001008004100002100001700043700001600060700002100076700001300097700001200110700001400122245019500136300001200331490000600343022001400349       2015                            d1 aD. Springate1 aD. Ashcroft1 aE. Kontopantelis1 aT. Doran1 aR. Ryan1 aD. Reeves00aCan analyses of electronic patient records be independently and externally validated? Study 2-the effect of beta-adrenoceptor blocker therapy on cancer survival: a retrospective cohort study  ae0072990 v5  a2044-6055