Suburban Hospital, Bethesda, Maryland, United States
University of Florida College of Medicine (Shands), Gainesville, Florida, United States
Johns Hopkins University, Baltimore, Maryland, United States
Memorial Sloan Kettering Cancer Center, New York, New York, United States
National Institutes of Health Clinical Center, 9000 Rockville Pike, Bethesda, Maryland, United States
National Institutes of Health Clinical Center, 9000 Rockville Pike, Bethesda, Maryland, United States
Jackson Heart Study, Jackson, Mississippi, United States
National Institutes of Health Clinical Center, 9000 Rockville Pike, Bethesda, Maryland, United States
Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, Tennessee, United States
University of Memphis Center for Community Health, Memphis, Tennessee, United States
National Institutes of Health Clinical Center, 9000 Rockville Pike, Bethesda, Maryland, United States
Sleep and Chronobiology Laboratory, Boulder, Colorado, United States
National Heart, Lung and Blood Institute (NHLBI), 9000 Rockville Pike, Bethesda, Maryland, United States