1. Division of Cardiovascular Sciences; National Heart, Lung, and Blood Institute; Bethesda Maryland USA
2. Department of Preventive Medicine; Northwestern University Feinberg School of Medicine; Chicago Illinois USA
3. Department of Health and Physical Activity; University of Pittsburgh; Pittsburgh Pennsylvania USA
4. Nemours Cardiac Center; A.I. DuPont Hospital for Children; Wilmington Delaware USA
5. Division of General Pediatrics; University of Michigan; Ann Arbor Michigan USA
6. Division of Preventive Medicine, Department of Medicine; University of Alabama at Birmingham; Birmingham Alabama USA
7. Department of Cardiology; Johns Hopkins University School of Medicine; Baltimore Maryland USA
8. Department of Radiology; Johns Hopkins University School of Medicine; Baltimore Maryland USA
9. Cardiovascular and Pulmonary Branch; National Heart, Lung, and Blood Institute; Bethesda Maryland USA