[1] Johns Hopkins Univ, Dana Ctr Prevent Ophthalmol, Wilmer Eye Inst, Sch Med, 600 North Wolfe St, Baltimore, MD 21287 USA
[2] Johns Hopkins Univ, Dept Epidemiol, Bloomberg Sch Publ Hlth, Baltimore, MD 21287 USA
[3] Johns Hopkins Univ, Dept Med, Bloomberg Sch Publ Hlth, Baltimore, MD 21287 USA
[4] Johns Hopkins Univ, Welch Ctr Prevent Epidemiol & Clin Res, Bloomberg Sch Publ Hlth, Baltimore, MD 21287 USA
[5] Ctr Dis Control & Prevent, Div Diabet Translat, Natl Ctr Chron Dis Prevent & Hlth Promot, Atlanta, GA USA