Outcomes of transcatheter and surgical aortic valve replacement in high-risk patients with aortic stenosis and left ventricular dysfunction: results from the Placement of Aortic Transcatheter Valves (PARTNER) trial (cohort A) - Elmariah, S; Palacios, I F; McAndrew, T; PARTNER Investigators (Circ Cardiovasc Interv, 2013)