[1] Medstar Washington Hosp Ctr, MedStar Heart & Vasc Inst, Adv Heart Failure Program, Washington, DC USA
[2] Georgetown Univ, Sch Med, Washington, DC USA
[3] Stanford Univ, Sch Med, Stanford Cardiovasc Inst, Div Cardiovasc Med, Palo Alto, CA USA
[4] 110 Irving St NW,Suite A112, Washington, DC 20010 USA