1. Keter Invest d.o.o.; Titova cesta 2a SI-2000 Maribor Slovenia
2. University of Ljubljana; Faculty of Civil and Geodetic Engineering; Hajdrihova 28 SI-1000 Ljubljana Slovenia
3. University of Ljubljana, Biotechnical Faculty; Department of Animal Science; Group for Microbiology and Microbial Biotechnology, Groblje 3 SI-1230 Domžale Slovenia
4. University of Innsbruck; Institute of Microbiology; Technikerstrasse 25 d 6020 Innsbruck Austria