Diabetic Retinopathy Severity and Peripheral Lesions Are Associated with Nonperfusion on Ultrawide Field Angiography (Silva, PS, Dela Cruz, AJ, Ledesma, MG, van Hemert, J, Radwan, A, Cavallerano, JD, Aiello, LM, Sun, JK and Aiello, LP), In Ophthalmology, volume 122, 2015.[bibtex]