1. New York Blood Center, Lindsley F. Kimball Research Institute, New York, New York, USA
2. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
3. Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, Minnesota, USA
4. Institute of Medical and Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China