[1] Univ Ulm, Ulm, Germany
[2] Helmholtz Zentrum Munchen, German Rsch Cntr Environm Hlth, Neuherberg, Germany
[3] Helmholtz Zentrum Munchen, Rsch Cntr Environm Hlth, Neuherberg, Germany
[4] Univ Dusseldorf, German Diabet Cntr, Cntr Diabet Rsch, D-40225 Dusseldorf, Germany