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We aimed to estimate incidences of any retinopathy and proliferative diabetic retinopathy (PDR) by direct ophthalmoscopy and relate them to baseline risk factors in re-examined diabetic survivors from 10 centres of the WHO Multinational Study of Vascular Disease in Diabetes.

The appearance of retinopathy and progression to proliferative retinopathy: the WHO multinational study of vascular disease in diabetes