[1] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[2] Midwest Eye Inst, Retina Serv, 10300 N Illinois St, Indianapolis, IN 46290 USA
[3] Johns Hopkins Univ, Sch Med, Wilmer Eye Inst, Retina Div, Baltimore, MD 21205 USA
[4] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[5] Indiana Univ, Sch Med, Dept Ophthalmol, Indianapolis, IN USA