1. State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, China CDC, P.O. Box 5, Changping, Beijing, China
2. School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
3. Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu Province, China
4. Anhui Provincial Center for Disease Control and Prevention, Hefei, Anhui Province, China
5. College of Life Sciences, Nankai University, Tianjin, China
6. Guizhou Medical College, Guiyang, Guizhou Province, China