Rush, C. J. , Campbell, R. T. , Jhund, P. S. , Petrie, M. C. and McMurray, J. J.V. (2018) Association is not causation: treatment effects cannot be estimated from observational data in heart failure. European Heart Journal , 39(37), pp. 3417-3438. (doi: 10.1093/eurheartj/ehy407 ) (PMID:30085087) (PMCID:PMC6166137)