HbA1c Variability as an Independent Risk Factor for Diabetic Retinopathy in Type 1 Diabetes: A German/Austrian Multicenter Analysis on 35,891 Patients. - Hermann, Julia M.; Hammes, Hans-Peter; Rami-Merhar, Birgit; Rosenbauer, Joachim; Schütt, Morten; Siegel, Erhard; Holl, Reinhard W. (PLoS ONE, 2014)