[1] Ctr Dis Control & Prevent, Atlanta, GA 30341 USA
[2] St Louis Univ, Sch Publ Hlth, Dept Community Hlth, St Louis, MO 63103 USA
[3] St Louis Univ, Sch Publ Hlth, Prevent Res Ctr, St Louis, MO 63103 USA
[4] New York Acad Med, Ctr Urban Epidemiol Studies, New York, NY USA
[5] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY USA