1. State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Xiaohongshan 44, Wuhan 430071, China
2. Key Lab of Medical Molecular Virology of MOE/MOH, Shanghai Medical College, Fudan University, 130 Dong An Road, Xuhui District, Shanghai 200032, China
3. Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY 10065, USA