1. School of Veterinary ScienceMassey University University Avenue, Palmerston North, 4474New Zealand
2. Department of Veterinary Clinical Medicine, College of Veterinary Medicine University of Illinois at Urbana‐Champaign 2001 South Lincoln Avenue UrbanaIllinois 61802 USA
3. IDEXX LaboratoriesMassey University University Avenue Palmerston North 4474 New Zealand
4. Animal Cancer Centre, Ontario Veterinary CollegeUniversity of Guelph 36 College Avenue West Guelph Ontario N1G 2W1 Canada