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)