[1] John H Stroger Jr Hosp Cook Cty, CORE Ctr, Chicago, IL 60612 USA
[2] Amer Acad Pediat, Div Hlth Serv Res, Elk Grove Village, IL USA
[3] Boston Univ, Sch Med, Div Infect Dis, Boston Med Ctr, Boston, MA 02118 USA
[4] St Jude Childrens Res Hosp, Dept Infect Dis, Memphis, TN 38105 USA
[5] Univ Tennessee, Ctr Hlth Sci, Dept Pediat, Memphis, TN 38163 USA
[6] Univ Tennessee, Ctr Hlth Sci, Dept Prevent Med, Memphis, TN 38163 USA
[7] Albert Einstein Coll Med, Adolescent AIDS Program, Montefiore Med Ctr, New York, NY USA