1. Central Animal Laboratory, University of Duisburg-Essen Medical School, Hufelandstr. 55, 45122 Essen, Germany;
2. University of Duisburg-Essen, Faculty of Biology, Department General Zoology, Universitätstr. 5–7, 45117 Essen, Germany
3. GIMmbH, Waldheimstr. 47, 14552 Michendorf, Germany;
4. Biodoc Biomedical Diagnostics, Feodor-Lynen-Straße 23, 30625 Hannover, Germany;