Healthcare resource utilization and costs among patients with heart failure with preserved, mildly reduced, and reduced ejection fraction in Spain. - Escobar, Carlos; Palacios, Beatriz; Varela, Luis; Gutiérrez, Martín; Duong, Mai; Chen, Hungta; Justo, Nahila; Cid-Ruzafa, Javier; Hernández, Ignacio; Hunt, Phillip R.; Delgado, Juan F. (BMC Health Services Research, 2022)