@article{Fortson2008,
author = {Fortson, J.G.},
title= {The gradient in Sub-Saharan Africa: Socioeconomic status and HIV/AIDS},
year = {2008},
doi = {10.1353/dem.0.0006},
journal = {Demography},
volume = {45},
number = {2},
pages = {303--322},
}