DOI: 10.1055/s-00000017

Experimental and Clinical Endocrinology & Diabetes

References

ETDRS.
Fundus photographic risk factors for progression of diabetic retinopathy. ETDRS report number 12. Early Treatment Diabetic Retinopathy Study Research Group. 
Ophthalmology 1991b; 98 ((5 Suppl)) 823-833  

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