Wu, X. [P:(DE-HGF)0] ; Brüggemann, N. [P:(DE-Juel1)142357] ; Gasche, R. [P:(DE-HGF)0] ; Papen, H. [P:(DE-HGF)0] ; Willibald, G. [P:(DE-HGF)0] ; Butterbach-Bahl, K. [P:(DE-HGF)0]