1. Companion Animal Cancer Research Unit, Department of Pathology, Faculty of Veterinary Science , Chulalongkorn University , Bangkok 10330 Thailand
2. Oncology Clinic, Small Animal Teaching Hospital, Faculty of Veterinary Science , Chulalongkorn University , Bangkok 10330 Thailand
3. Department of Veterinary Pathobiology, Faculty of Veterinary Medicine , Khon Kaen University , Khon Kaen 40002 Thailand