1. Rush University Medical Center, Division of Cardiology; 1717 W. Congress Pkwy, Chicago, IL 60612, USA
2. Northwestern University Feinberg School of Medicine, Division of Cardiology; 420 E. Superior St., Chicago, IL 60611, USA
3. University of Chicago Medical Center, Section of Cardiology; 5758 S. Maryland Avenue, Chicago, IL 60637, USA