1. From the Department of Medicine (M.D.M., V.N., H.D.V., J.A.C.L.), Johns Hopkins University, Baltimore, MD
2. Department of Internal Medicine, Federal University of Santa Maria, Rio Grande do Sul, Brazil (M.D.M.)
3. Department of Radiology (B.A.-V.), Johns Hopkins University, Baltimore, MD
4. Federal University of Vale do São Francisco, Pernambuco, Brazil (H.D.V.)
5. Office of Biostatistics, National Institutes of Health, Bethesda, MD (C.W.)
6. Division of Cardiovascular Medicine, Department of Medicine, University of Southern California, Los Angeles (H.B.)
7. Department of Pathology, University of Vermont, Colchester (R.P.T., M.C.)
8. Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison (D.A.B.).