1. Institute of Parasitology, University of Zürich, Winterthurstrasse 266A, CH-8057 Zürich, Switzerland
2. Institute of Animal Pathology, University of Berne, Länggasstrasse 122A, CH-3012 Bern, Switzerland
3. Department of Clinical Veterinary Medicine, Bremgartenstrasse 109a, PO Box, CH-3001 Berne, Switzerland
4. Labor Dr. Böse GmbH, Richthofenstraße 29, D-31137 Hildesheim, Germany
5. Research Institute for Animal Ecology, University of Veterinary Medicine, Savoyen Strasse 1, A-1160 Vienna, Austria
6. International Takhi Group, Takhin Tal, Mongolia