1. Department of Epidemiology; Johns Hopkins Bloomberg School of Public Health; Baltimore MD USA
2. Human Genetics Center; University of Texas School of Public Health; Houston TX USA
3. Department of Medicine; Baylor College of Medicine; Houston TX USA
4. Center for Cardiovascular Disease Prevention; Methodist DeBakey Heart and Vascular Center; Houston TX USA
5. Department of Medicine; The Johns Hopkins University; School of Medicine; Baltimore MD USA
6. Welch Center for Prevention, Epidemiology and Clinical Research; Johns Hopkins Medical Institutions; Baltimore MD USA