RT Journal Article SR Electronic T1 Diabetic retinopathy in Nigerians. A study of 758 patients. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 652 OP 663 DO 10.1136/bjo.53.10.652 VO 53 IS 10 A1 B O Osuntokun YR 1969 UL http://bjo.bmj.com/content/53/10/652.abstract AB