[1] German Diabet Ctr, Inst Clin Biochem & Pathobiochem, D-40225 Dusseldorf, Germany
[2] Univ Dusseldorf, Dept Cardiovasc Surg, Dusseldorf, Germany
[3] Leiden Univ, Dept Mol Cell Biol, Med Ctr, Leiden, Netherlands
[4] Ghent Univ Hosp, Dept Endocrinol, Ghent, Belgium