[1] Univ Penn, Scheie Eye Inst, Ophthalmol, Philadelphia, PA 19104 USA
[2] Univ Penn, Psychol, Philadelphia, PA 19104 USA
[3] Stanford Univ, Ophthalmol, Stanford, CA 94305 USA
[4] Univ Penn, Ctr Adv Retinal & Ophthalm Therapeut, Ophthalmol, Philadelphia, PA 19104 USA