Fisseha, R. [P:(DE-Juel1)VDB66615] ; Dommen, J. [P:(DE-HGF)0] ; Gutzwiller, L. [P:(DE-HGF)0] ; Weingartner, E. [P:(DE-HGF)0] ; Gysel, M. [P:(DE-HGF)0] ; Emmenegger, C. [P:(DE-HGF)0] ; Kalberer, M. [P:(DE-HGF)0] ; Baltensperger, U. [P:(DE-HGF)0]