1. Institut für Virologie, Freie Universität Berlin, Berlin, Germany
2. National Veterinary Product Engineering Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing, Jiangsu, China
3. National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency (NSTDA), Pathumthani, Thailand
4. Department of Infectious Disease and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong