Weigand, M. [P:(DE-HGF)0] ; Pfeifer, J. [P:(DE-Juel1)140327] ; Nagel, K. [P:(DE-Juel1)129373] ; Zimmermann, E. [P:(DE-Juel1)133962] ; Waler, A. [P:(DE-HGF)0] ; Kemna, A. [P:(DE-HGF)0]