1. Medical School, Jiangsu Provincial Key Laboratory of Medicine, Nanjing University, Nanjing, China
2. Shanxi Provincial Key Laboratory for Functional Proteins, School of Basic Medical Sciences, Shanxi Medical University, Taiyuan, China
3. Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, China
4. Department of Veterinary Biomedical Sciences, College of Veterinary Medicine, University of Minnesota at Twin Cities, St. Paul, Minnesota, USA