Schlüpen, C. [P:(DE-Juel1)VDB2846] ; Weber, U. [P:(DE-Juel1)VDB2942] ; de Graaf, A. A. [P:(DE-Juel1)VDB493] ; Revuelta, J. L. [P:(DE-HGF)0] ; Stahmann, K.-P. [P:(DE-Juel1)VDB1560]