Map of CCTRN sites. Clinical Centers: 1 Cleveland Clinic, Cleveland, Ohio; 2 Texas Heart Institute; 3 University of Florida at Gainesville, Gainesville, Florida; 4 Minneapolis Heart Institute, Minneapolis, Minnesota; 5 Vanderbilt University Medical Center, Nashville, Tennessee; 6 Study Sponsor, NHLBI Bethesda, Maryland; 7 Data Coordinating Center, Houston, Texas; 8 Bio-Repository, Minneapolis, Minnesota; 9 Bio-Repository, Gainesville, Florida; 10 Echo Core Lab, Cleveland, Ohio; 11 MRI Core Lab, Gainesville, Florida; 12 MV02 Core Lab, Gainesville, Florida; 13 SPECT Core Lab, Nashville, Tennessee; 14 Cell Processing Quality Control Lab, Houston, Texas