1. Institute for Milk Hygiene, Milk Technology and Food Science, Veterinärplatz 1, 1210 Vienna, Austria
2. Institute for Medical Physics and Biostatistics, Veterinärplatz 1, 1210 Vienna, Austria
3. Congen Biotechnologie, Robert-Roessle Strasse 10, 13125 Berlin, Germany
4. Danish Veterinary Institute, Bülowsvej 27, DK-1790 Copenhagen, Denmark