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Study design. ETDRS, Early Treatment Diabetic Retinopathy Study; OCT, optical coherence tomography; HbA1c, glycated hemoglobin; ALT, alanine aminotransferase; TSH, thyroid-stimulating hormone; DME, diabetic macular edema; TID, three times a day; NPDR, non-proliferative diabetic retinopathy; PDR, proliferative diabetic retinopathy.
