1. Division of Intramural Research, National Institute on Minority Health and Health Disparities, Gateway Building, 533N, 7201 Wisconsin Avenue, Bethesda, MD 20814-4808, USA
2. Department of Health Services Management and Policy, College of Public Health, East Tennessee State University, Johnson City, TN, USA
3. Department of Health Management and Informatics, School of Medicine, University of Missouri, Columbia, MO, USA