JAMA. 2003 Nov 19;290(19):2581-7.
Predicting mortality among patients hospitalized for heart failure: derivation and validation of a clinical model.
Lee DS, Austin PC, Rouleau JL, Liu PP, Naimark D, Tu JV,
Department of Health Policy, Management, and Evaluation/Clinical Epidemiology, Division of Cardiology, University Health Network-Toronto General Hospital, Toronto, Ontario.