TY - STAND AU - D. Springate AU - D. Ashcroft AU - E. Kontopantelis AU - T. Doran AU - R. Ryan AU - D. Reeves BT - BMJ Open DO - 10.1136/bmjopen-2014-007299 M1 - 4 PY - 2015 EP - e007299 T2 - BMJ Open TI - Can analyses of electronic patient records be independently and externally validated? Study 2\textendashthe effect of beta-adrenoceptor blocker therapy on cancer survival: a retrospective cohort study VL - 5 SN - 2044-6055 ER -