title: Has the frequency of proliferative diabetic retinopathy declined in the US?
authors.forename: Ronald
authors.initials: R
authors.lastname: Klein
mesh_terms: D001794:Blood Pressure; D003930:Diabetic Retinopathy / Q000453:epidemiology* / Q000503:physiopathology; D006801:Humans; D015995:Prevalence; D014481:United States / Q000453:epidemiology