Natural history of left ventricular ejection fraction in patients with heart failure.
Clarke CL, Grunwald GK, Allen LA, BarĂ³n AE, Peterson PN, Brand DW, Magid DJ, Masoudi FA. Natural history of left ventricular ejection fraction in patients with heart failure. Circ Cardiovasc Qual Outcomes. 2013 Nov; 6(6):680-6.