Evolution of economic burden of heart failure by ejection fraction in newly diagnosed patients in Spain. - Escobar, Carlos; Palacios, Beatriz; Gonzalez, Victoria; Gutiérrez, Martín; Duong, Mai; Chen, Hungta; Justo, Nahila; Cid-Ruzafa, Javier; Hernández, Ignacio; Hunt, Phillip R.; Delgado, Juan F. (BMC Health Services Research, 2023)