1. School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, P.R. China.
2. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P.R. China.
3. College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, P.R. China.
4. Animal Husbandry and Veterinary Science Research Institute of Jilin Province, Changchun, P.R. China.
5. Shanghai Institute for Emerging and Re-emerging Infectious Diseases, Shanghai Public Health Clinical Center, Shanghai, P.R. China.
6. Center for Medical Genetics and Genomics, The Second Affiliated Hospital of Guangxi Medical University, Nanning, P.R. China.