求助文獻！！有鏈接！！

【作者(必填)】Ronald Klein, MD, MPH; Barbara E. K. Klein, MD, MPH; Scot E. Moss, MA; Matthew D. Davis, MD; David L. DeMets, PhD

【文题(必填)】The Wisconsin Epidemiologic Study of Diabetic Retinopathy

X. Four-Year Incidence and Progression of Diabetic Retinopathy When Age at Diagnosis Is 30 Years or More

【年份(必填)】1989

【全文链接或数据库名称(选填)】http://archopht.ama-assn.org/cgi/content/abstract/107/2/244