1. Department of Cardiovascular Medicine Mayo Clinic Rochester Minnesota USA
2. Robert D. and Patricia E. Kern Center for the Science of Health Care Delivery Mayo Clinic Rochester Minnesota USA
3. Department of Critical Care Medicine and Division of Cardiology, Department of Medicine University of Alberta Hospital Edmonton Canada
4. The Carl and Edyth Lindner Center for Research and Education The Christ Hospital Health Network Cincinnati Ohio USA
5. Sentara Heart Hospital Advanced Heart Failure Center and Eastern Virginia Medical School Norfolk Virginia USA