[1] Amer Univ, Sociol Dept, 4400 Massachusetts Ave NW, Washington, DC 20016 USA
[2] Yale Sch Publ Hlth, Epidemiol Microbial Dis Dept, New Haven, CT USA
[3] Yale Sch Publ Hlth, Dept Social & Behav Sci, New Haven, CT USA
[4] Drexel Univ, Dornsife Sch Publ Hlth, Dept Community Hlth & Prevent, Philadelphia, PA 19104 USA