Gastric bypass improves subclinical nephropathy in non-severely obese patients (BMI < 35 kg/m2) with type 2 diabetes mellitus - Billeter, AT; Kopf, S; Israel, B; Schulte, T; Knefeli, P; Büchler, MW; Nawroth, PP; Müller, BP (Diabetologie und Stoffwechsel, 2015)