1. Institute of Applied Synthetic Chemistry; Technische Universität Wien; Getreidemarkt 9 1060 Vienna Austria
2. Christian Doppler Research Association; Boltzmanngasse 20 1090 Vienna Austria
3. Institute for Inorganic Chemistry; Graz University of Technology; Stremayrgasse 9/V 8010 Graz Austria
4. Ivoclar Vivadent AG; Bendererstraße 2 9494 Schaan Liechenstein