María Anguita-Gámez, Alberto Esteban-Fernández, Juan L. Bonilla-Palomas, José L. Bernal, Náyade del Prado, Cristina Fernández-Pérez, Francisco J. Elola-Somoza, Manuel Anguita-Sánchez. Gender differences in clinical features and outcomes of patients over 75 years presenting with acute heart failure. Results of a nationwide study