[1] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Mental Hlth, Baltimore, MD 21205 USA
[2] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Populat Family & Reprod Hlth, Baltimore, MD USA
[3] Michigan State Univ, Dept Family Med, Div Publ Hlth, E Lansing, MI 48824 USA
[4] Wake Forest Univ, Bowman Gray Sch Med, Winston Salem, NC USA
[5] Univ Maryland, Sch Publ Hlth, College Pk, MD 20742 USA
[6] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[7] Northwestern Univ, Feinberg Sch Med, Evanston, IL USA