[1] Stanford Univ, Sch Med, Dept Ophthalmol, Byers Eye Inst, 2452 Watson Court, Palo Alto, CA 94304 USA
[2] Yale Sch Med, Dept Ophthalmol & Visual Sci, New Haven, CT USA
[3] Johns Hopkins Univ, Wilmer Eye Inst, Baltimore, MD 21218 USA
[4] Harvard Med Sch, Dept Ophthalmol, Boston, MA 02115 USA
[5] Massachusetts Eye & Ear, Retina Serv, Boston, MA USA
[6] Manhattan Retina & Eye Consultants, New York, NY USA