Deep learning for diabetic retinopathy detection and classification based on fundus images: A review. - Nikos Tsiknakis; Dimitris Theodoropoulos; Georgios C. Manikis; Emmanouil Ktistakis; Ourania Boutsora; Alexa Berto; Fabio Scarpa; Alberto Scarpa; Dimitrios I. Fotiadis; Kostas Marias (Comput. Biol. Medicine, 2021)