Abou-Hamad, I. [P:(DE-HGF)0] ; Mitchel, S. J. [P:(DE-HGF)0] ; Wandlowski, Th. [P:(DE-Juel1)VDB9859] ; Rikvold, P. A. [P:(DE-HGF)0] ; Brown, G. [P:(DE-HGF)0]