Correction: Prevalence and Progression Rate of Diabetic Retinopathy in Type 2 Diabetes Patients in Correlation with the Duration of Diabetes - Voigt, Margarete; Schmidt, Sebastian; Lehmann, Thomas; Köhler, Benjamin; Kloos, Christof; Voigt, Ulrich A.; Meller, Daniel; Wolf, Gunter; Müller, Ulrich A.; Müller, Nicolle (Experimental and Clinical Endocrinology & Diabetes, 2018)