[1] Cleveland Clin, Nursing Inst, Cleveland, OH 44195 USA
[2] Cleveland Clin, Inst Heart & Vasc, Kaufman Ctr Heart Failure, Cleveland, OH 44195 USA
[3] Western Piedmont Heart Ctr, Heart Funct Clin, Hickory, NC USA
[4] Univ Wisconsin Hosp & Clin, Ventricular Assist Device Programs, Madison, WI 53792 USA