1. Norwegian University of Life Sciences, Faculty of Veterinary Medicine, Department of Companion Animal Clinical Sciences, PO Box 369 Sentrum, 0102 Oslo, Norway
2. Oslo University Hospital, Division of Laboratory Medicine, Department of Forensic Sciences, PO Box 4450 Nydalen, 0424 Oslo, Norway
3. Norwegian Veterinary Institute, PO Box 750 Sentrum, 0106 Oslo, Norway