1. Department of Cardiovascular Sciences, Louisiana State University Health Shreveport, Shreveport, Louisiana.
2. Department of Epidemiology, Milken Institute School of Public Health, George Washington University, Washington, District of Columbia, USA.
3. Department of Internal Medicine, Division of Infectious Diseases, Howard University, Washington, District of Columbia, USA.
4. Mid-Atlantic Permanente Research Institute, Kaiser Permanente Mid-Atlantic States, Rockville, Maryland, USA.