1. Departments of Preventive Medicine and Medicine; Northwestern University; Chicago IL
2. Division of Gastroenterology & Hepatology; Northwestern University; Chicago IL
3. Division of Cardiology; Northwestern University; Chicago IL
4. Departments of Radiology; Cardiovascular Medicine and Biomedical Informatics, Vanderbilt University School of Medicine; Nashville TN
5. Departments of Medicine and Radiology; Johns Hopkins University School of Medicine; Baltimore MD
6. Department of Medicine; Division of Preventive Medicine; University of Alabama Birmingham School of Medicine; Birmingham AL