1. Social Science Research Center, Mississippi State University, Starkville, Mississippi.
2. Department of Global Health and Population, Harvard School of Public Health, Boston, Massachusetts.
3. Department of Health Policy and Management, Boston University School of Public Health, Boston, Massachusetts.
4. Center for Healthcare Organization and Implementation Research, ENRM VA Hospital, Boston, Massachusetts.
5. Section of Infectious Diseases, Boston University School of Medicine, Boston, Massachusetts.