[1] Heinrich Heine Univ Dusseldorf, Med Fac, Dept Endocrinol & Diabetol, Dusseldorf, Germany
[2] Heinrich Heine Univ Dusseldorf, Univ Hosp, Dusseldorf, Germany
[3] Heinrich Heine Univ Dusseldorf, German Diabet Ctr, Inst Clin Diabetol, Leibniz Ctr Diabet Res, Dusseldorf, Germany
[4] German Ctr Diabet Res, Partner Dusseldorf, Munich, Germany
[5] Heinrich Heine Univ Dusseldorf, Inst Clin Biochem & Pathobiochem, Leibniz Ctr Diabet Res, German Diabet Ctr, Dusseldorf, Germany
[6] Heinrich Heine Univ Dusseldorf, German Diabet Ctr, Inst Biometr & Epidemiol, Leibniz Ctr Diabet Res, Dusseldorf, Germany
[7] Mayo Clin, Div Endocrinol Diabet & Nutr, Rochester, MN USA
[8] Heinrich Heine Univ Dusseldorf, Med Fac, Inst Biochem & Mol Biol 1, Dusseldorf, Germany
[9] Heinrich Heine Univ Dusseldorf, Univ Hosp Dusseldorf, Dusseldorf, Germany
[10] Heidelberg Univ, Dept Internal Med, Heidelberg, Germany