1. Department of Pharmacology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand.
2. Department of Farm Resources and Production Medicine, Faculty of Veterinary Medicine, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand.
3. Agricultural Toxic Substance Research Group, Agricultural Production Sciences Research and Development Division, Department of Agriculture, Ministry of Agriculture and Cooperatives, Bangkok 10900, Thailand.
4. Department of Veterinary Sciences, University of Pisa, Via Livornese (latomonte), San Piero a Grado, Italy.