Epping, A. [P:(DE-Juel1)145909] ; Engels, S. [P:(DE-HGF)0] ; Volk, C. [P:(DE-HGF)0] ; Watanabe, K. [P:(DE-HGF)0] ; Taniguchi, T. [P:(DE-HGF)0] ; Trellenkamp, S. [P:(DE-Juel1)128856] ; Stampfer, C. [P:(DE-HGF)0]