[1] German Inst Human Nutr Potsdam, Grp Energy Metab, D-14458 Nuthetal, Germany
[2] Aventis Pharma Deutschland GmbH, DG Metab Dis, Frankfurt, Germany
[3] Aventis Pharma Deutschland GmbH, DI&A Chem Med Chem, Frankfurt, Germany
[4] Inst Zoo & Wildlife Res, Berlin, Germany