Factors protective against retinopathy in insulin-dependent diabetics free of retinopathy for 30 years.Br Med J (Clin Res Ed) 1982; 285 doi: https://doi.org/10.1136/bmj.285.6355.1658-a (Published 04 December 1982) Cite this as: Br Med J (Clin Res Ed) 1982;285:1658
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