Corrigendum to “The Threshold of the Severity of Diabetic Retinopathy below Which Intensive Glycemic Control Is Beneficial in Diabetic Patients: Estimation Using Data from Large Randomized Clinical Trials” by Yuqi Liu,Juan Li, Jinfang Ma, Nanwei Tong - Yuqi Liu; Juan Li; Jinfang Ma; Nanwei Tong (Journal of Diabetes Research)