[1] Univ Michigan, Dept Epidemiol, Ctr Social Epidemiol & Populat Hlth, Sch Publ Hlth, Ann Arbor, MI 48109 USA
[2] Johns Hopkins Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[3] New York Acad Med, Ctr Urban Epidemiol Studies, New York, NY USA
[4] Columbia Univ, Dept Epidemiol, Mailman Sch Publ Hlth, New York, NY USA