Engel, A. [P:(DE-HGF)0] ; Brunner, D. [P:(DE-HGF)0] ; Fischer, H. [P:(DE-HGF)0] ; Schiller, C. [P:(DE-Juel1)VDB1410] ; Wirth, V. [P:(DE-HGF)0] ; Wernli, H. [P:(DE-HGF)0] ; Schmidt, U. [P:(DE-HGF)0]