1. Department of Veterinary Clinical Sciences, University of Minnesota College of Veterinary Medicine, Saint Paul, MN 55108, USA
2. Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA
3. Department of Radiation Oncology, University of Minnesota Medical School, Minneapolis, MN 55455, USA
4. The Hormel Institute, University of Minnesota, 801 16th Ave NE, Austin, MN 55912, USA