Fan W, Uji A, Nittala M, Wykoff CC, Brown D, Fleming A, Robertson G, van Hemert J, Sadda S, Ip MS. Retinal vascular bed area on ultra-wide field fluorescein angiography indicates the severity of diabetic retinopathy. Br J Ophthalmol. 2022 Aug;106(8):1126-31. doi: 10.1136/bjophthalmol-2020-317488