1National Heart, Lung, and Blood Institute, Division of Intramural Research, Population Sciences Branch, Bethesda, MD, USA
2the Framingham Heart Study, Framingham, MA, USA
3National Heart, Lung, and Blood Institute, Division of Intramural Research, DNA Sequencing and Genomics Core Laboratory, Bethesda, MD, USA,
4Department of Medicine, Division of Cardiovascular Medicine, University of Massachusetts Medical School, Worcester, MA, USA, and
5Memorial Heart and Vascular Center, University of Massachusetts, Worcester, MA, USA