1 Department of Laboratory Medicine, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430070, PR China.
2 Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60208, USA.
3 Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing 400016, PR China.
4 Institute of Virology, University Hospital Essen, University of Duisburg-Essen, 47048 Duisburg, Germany.