[1] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD 21205 USA
[2] Mayo Clin Arizona, Phoenix, AZ 85054 USA
[3] Michigan State Univ, Coll Human Med, Flint, MI USA
[4] Howard Univ, Sch Med, Washington, DC 20059 USA
[5] Michigan State Univ, Dept Family Med, Flint, MI USA
[6] Kaiser Permanente, Oakland, CA USA
[7] Michigan State Univ, Coll Human Med, Div Publ Hlth, Flint, MI USA
[8] Boston Childrens Hosp, Boston, MA USA
[9] Harvard Med Sch, Boston, MA 02115 USA
[10] Michigan State Univ, Dept Epidemiol & Biostat, Flint, MI USA