[1] Howard Univ Hosp, Dept Ophthalmol, Washington, DC USA
[2] Johns Hopkins Univ, Sch Med, Wilmer Eye Inst, Baltimore, MD USA
[3] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Biostat, Baltimore, MD USA
[4] Johns Hopkins Sch Nursing, Johns Hopkins Disabil Hlth Res Ctr, Baltimore, MD USA
[5] Johns Hopkins Univ, Johns Hopkins Disabil Hlth Res Ctr, Baltimore, MD USA
[6] Johns Hopkins Sch Nursing, Baltimore, MD USA
[7] Johns Hopkins Univ, Sch Med, Wilmer Eye Inst, Retina Div, Baltimore, MD 21205 USA