1. Johns Hopkins Bloomberg School of Public Health (J.S., D.L.R.), Johns Hopkins University, Baltimore.
2. National Human Genome Research Institute (J.S.), National Institutes of Health, Bethesda, MD.
3. Division of Cardiology, Department of Medicine (C.T., C.P., B.M., H.C., C.A.J.), Johns Hopkins University, Baltimore.
4. Department of Medical Genetics, University of Alberta, Edmonton, Canada (S.C.).
5. Center for Cancer Research, National Cancer Institute (L.J.), National Institutes of Health, Bethesda, MD.
6. Department of Bioethics, Clinical Center (L.J.), National Institutes of Health, Bethesda, MD.