1. School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimachi, Bunkyodai, Ebetsu, Hokkaido, Japan
2. National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
3. National Veterinary Drug Assay Laboratory, Jin Raya Pembangunan, Bogor 16340, Jawa Barat, Indonesia
4. Department of Veterinary Microbiology, Faculty of Veterinary Science, Chulalongkorn University, Henri Dunant Rd., Pathumwa, Bangkok 10310, Thailand