[1] Johns Hopkins Sch Med, Wilmer Eye Inst, Baltimore, MD USA
[2] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, 2024 E Monument St, Baltimore, MD 21287 USA
[3] Univ N Carolina, Div Comprehens Oral Hlth Periodontol, Adams Sch Dent, Chapel Hill, NC 27515 USA
[4] Univ N Carolina, Dept Epidemiol, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27515 USA
[5] Univ Calif San Diego, Dept Family Med, San Diego, CA 92103 USA
[6] Univ Minnesota, Sch Publ Hlth, Div Epidemiol & Community Hlth, Minneapolis, MN USA