Spahn, H. [P:(DE-Juel1)VDB65140] ; Wegener, R. [P:(DE-Juel1)2367] ; Wahner, A. [P:(DE-Juel1)16324] ; Krebsbach, M. [P:(DE-HGF)0] ; Knieling, P. [P:(DE-HGF)0] ; Heuser, H.P. [P:(DE-HGF)0] ; Koppmann, R. [P:(DE-HGF)0]