Spichtinger, P. [P:(DE-HGF)0] ; Gierens, K. [P:(DE-HGF)0] ; Smit, H. G. J. [P:(DE-Juel1)16203] ; Ovarlez, J. [P:(DE-HGF)0] ; Gayet, J. F. [P:(DE-HGF)0]