1. Department of Basic Sciences and Aquatic Medicine; Norwegian University of Life Sciences, NMBU; Postboks 8146 Dep 0033 Oslo Norway
2. Department of Companion Animal Clinical Sciences; Norwegian University of Life Sciences, NMBU; Postboks 8146 Dep 0033 Oslo Norway
3. Department of Clinical Sciences; Swedish University of Agricultural Sciences; Box 7054 75007 Uppsala Sweden
4. Aros Veterinär Centrum; Olof Palmes Torg 10 723 34 Västerås Sweden
5. Faculty of Veterinary Science; The University of Sydney; Sydney NSW 2006 Australia