title: Catch-22.
authors.forename: M B
authors.initials: MB
authors.lastname: Davidson
mesh_terms: D003920:Diabetes Mellitus / Q000175:diagnosis*; D003930:Diabetic Retinopathy; D005951:Glucose Tolerance Test; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D012307:Risk Factors
chemical_list: D006442:Glycated Hemoglobin