[1] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[2] Tufts Univ, New England Eye Ctr, Tufts Med Ctr, Dept Ophthalmol,Sch Med, Boston, MA USA
[3] Johns Hopkins Bloomberg Sch Publ Hlth Baltimore, Dept Epidemiol, Maryland, NY USA
[4] Thomas Jefferson Univ, Wills Eye Hosp, Retina Serv, Mid Atlantic Retina, Philadelphia, PA USA
[5] Walter Reed Natl Mil Med Ctr, Dept Ophthalmol, Bethesda, MD USA
[6] Univ Miami, Miller Sch Med, Bascom Palmer Eye Inst, Dept Ophthalmol, Miami, FL USA
[7] Harvard Med Sch, Dept Ophthalmol, Massachusetts Eye & Ear, Boston, MA USA
[8] Johns Hopkins Univ, Sch Med, Wilmer Eye Inst, Johns Hopkins Hosp, Baltimore, MD USA