[1] John H Stroger Hosp Cook Cty, Chicago, IL 60612 USA
[2] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[3] CDC, Div STD Prevent, Natl Ctr HIV Viral Hepatitis STD & TB Prevent, Atlanta, GA USA
[4] Chicago Dept Publ Hlth, Syndem Infect Dis Bur, Chicago, IL USA