Ruia, S. ., Saxena, S. ., Cheung, C. G., Gilhotra, J. ., & Lai, T. . (1969). Spectral Domain Optical Coherence Tomography Features and Classification Systems for Diabetic Macular Edema: A Review. Asia-Pacific Journal of Ophthalmology (Philadelphia, Pa.), 5(5), 360-7. https://doi.org/10.1097/APO.0000000000000218 (Original work published 1969)