1. a Morehouse School of Medicine , Community Health and Preventive Medicine , 720 Westview Drive, S.W., Atlanta, GA, 30310-1495, USA
2. b University of Alabama , Biostatistics, 153 WTI, 1824 6th Avenue South, Birmingham, AL, 35294-3300, USA
3. c Center for Disease Control and Prevention , Atlanta, GA, 30329-4018, USA
4. d Morehouse School of Medicine Community Health and Preventive Medicine , 720 Westview Drive, S.W., Atlanta, GA, 30310, USA
5. e University of Georgia, Department of Sociology, Institute for African American Studies , 417 Baldwin Hall, Athens, GA, 30602, USA