1. National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
2. Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, 2-11 Inada, Obihiro, Hokkaido 080-8555, Japan
3. College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala, Uganda
4. Japan Livestock Technology Association, 3-20-9 Yushima, Bunkyo-ku, Tokyo 113-0034, Japan