1 MedStar Washington Hospital Center, MedStar Heart and Vascular Institute, Advanced Heart Failure Program, Washington, DC; Georgetown University School of Medicine, Washington, DC.
2 Georgetown University School of Medicine, Washington, DC.
3 Stanford Cardiovascular Institute, Stanford University School of Medicine; Division of Cardiovascular Medicine, Stanford University School of Medicine, Palo Alto, CA.
4 MedStar Washington Hospital Center, MedStar Heart and Vascular Institute, Advanced Heart Failure Program, Washington, DC; Georgetown University School of Medicine, Washington, DC. Electronic address: [email protected].