Diabetic retinopathy in Euro-Brazilian type 2 diabetic patients: relationship with polymorphisms in the aldose reductase, the plasminogen activator inhibitor-1 and the methylenetetrahydrofolate reductase genes - Santos, Katia G.; Tschiedel, Balduino; Schneider, João; Souto, Katia; Roisenberg, Israel (Diabetes Research & Clinical Practice, 2003)