1. Department of Medicine, University of California San Francisco, San Francisco, California (J.R.)
2. Department of Cardiology, Johns Hopkins University, Baltimore, Maryland (M.T.O., M.S., D.V., R.H., D.M., V.W., S.T., D.R.T.)
3. Department of Pediatrics, Johns Hopkins University, Baltimore, Maryland (Y.L.)
4. Department of Cardiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania (S.N.)
5. Department of Cardiology and Departments of Radiology and Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland (H.R.H.).