Weigand, M. [P:(DE-HGF)0] ; Pfeifer, Johannes [P:(DE-Juel1)140327] ; Nagel, Kerstin [P:(DE-Juel1)129373] ; Zimmermann, Egon [P:(DE-Juel1)133962] ; Walter, Achim [P:(DE-Juel1)129417] ; Kemna, A. [P:(DE-HGF)0]