Du, N. [P:(DE-HGF)0] ; Skorupa, I. [P:(DE-HGF)0] ; Bürger, D. [P:(DE-HGF)0] ; Menzel, Stephan [P:(DE-Juel1)158062] ; Waser, R. [P:(DE-Juel1)131022] ; Schulz, S. [P:(DE-HGF)0] ; Schmidt, H. [P:(DE-HGF)0]