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Reeves, D., Springate, D. A., Ashcroft, D. M., Ryan, R., Doran, T., Morris, R., Olier, I., & Kontopantelis, E. (2014). can analyses of electronic patient records be independently and externally validated? The effect of statins on the mortality of patients with ischaemic heart disease: a cohort study with nested case–control analysis. BMJ open, 4(4), . http://access.bl.uk/ark:/81055/vdc_100135148474.0x00000c