**Acknowledgements**

The authors gratefully acknowledge generous funding from the Center of Excellence for Companion Animal Cancer, Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand. C. Setthawongsin was supported by the Kasetsart University Research and Development Institute (KURDI) and the Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand.
