[1] Helmholtz Zentrum Munchen, Helmholtz Diabet Ctr HDC, Inst Diabet & Obes, Neuherberg, Germany
[2] German Natl Diabet Ctr DZD, Neuherberg, Germany
[3] Univ Copenhagen, Dept Nutr Exercise & Sports, Sect Mol Physiol, Copenhagen, Denmark
[4] Eberhard Karls Univ Hosp & Clin, Inst Expt & Clin Pharmacol & Pharmacogen, Dept Pharmacol Expt Therapy & Toxicol, Tubingen, Germany