[1] Univ Colorado, Dept Ophthalmol, Sch Med, Aurora, CO USA
[2] Johns Hopkins Sch Med, Wilmer Eye Inst, Baltimore, MD USA
[3] Johns Hopkins Univ, Dana Ctr Prevent Ophthalmol, Baltimore, MD USA
[4] Johns Hopkins Sch Educ, Ctr Res & Reform Educ, Baltimore, MD USA
[5] Univ Pikeville, Kentucky Coll Optometry, Pikeville, KY USA
[6] Massachusetts Eye & Ear Infirm, Glaucoma Ctr Excellence, Boston, MA 02114 USA
[7] Johns Hopkins Univ, Berman Inst Bioeth, Baltimore, MD USA