Stoffers, A. [P:(DE-HGF)0] ; Ziebarth, B. [P:(DE-HGF)0] ; Barthel, J. [P:(DE-Juel1)130525] ; Cojocaru-Mirédin, O. [P:(DE-HGF)0] ; Elsässer, C. [P:(DE-HGF)0] ; Raabe, D. [P:(DE-HGF)0]