RT Journal Article SR Electronic T1 Letter: Proliferative diabetic retinopathy. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 560 DO 10.1136/bjo.58.5.560 VO 58 IS 5 A1 Ederer, F YR 1974 UL http://bjo.bmj.com/content/58/5/560.abstract AB