Kanu Chatterjee MBBS FRCP (London) FRCP (Edinburgh) FCCP FACC MACPClinical Professor of Medicine, The Carver College of Medicine, University of Iowa; Emeritus Professor of Medicine, University of California San Francisco, California, USAPhillip A Horwitz MDProfessor of Medicine, Clinical Chief Cardiovascular Medicine, The Carver College of Medicine, University of Iowa, USA