[1] RWTH Aachen Univ Hosp, Dept Internal Med Cardiol Angiol & Internal Intens, Pauwelsstr 30, D-52074 Aachen, Germany
[2] CRS Clin Res Serv Mannheim GmbH, Mannheim, Germany
[3] Univ Hosp Tubingen, Dept Internal Med 4, Tubingen, Germany
[4] Univ Tubingen, Inst Diabet Res & Metab Dis IDM, Helmholtz Ctr Munich, German Ctr Diabet Res DZD eV, Tubingen, Germany
[5] Med Univ Graz, LKH Univ Hosp Graz, Dept Internal Med, Div Cardiol, Graz, Austria