@article{Koumans2001,
author = {Koumans, E.H. and Farley, T.A. and Gibson, J.J. and Langley, C. and Ross, M.W. and McFarlane, M. and Braxton, J. and St Louis, M.E.},
title= {Characteristics of persons with syphilis in areas of persisting syphilis in the United States: Sustained transmission associated with concurrent partnerships},
year = {2001},
doi = {10.1097/00007435-200109000-00004},
journal = {Sexually Transmitted Diseases},
volume = {28},
number = {9},
pages = {497--503},
}