1. Department of Medicine, Division of Cardiology, Advanced Heart Failure, Rush University Medical Center, Chicago, IL, USA
2. Department of Medicine, Division of Cardiology, University of Chicago, Chicago, IL, USA
3. Department of Medicine, Division of Cardiology, Washington University School of Medicine/Barnes Jewish Hospital, St. Louis, MO, USA
4. Department of Medicine, Division of Cardiology, Columbia University Medical Center/New York-Presbyterian Hospital, New York, NY, USA