1. Lindsley F. Kimball Research Institute, New York Blood CenterNew YorkNew YorkUSA
2. Beijing Institute of Pharmacology and ToxicologyBeijingChina
3. The Institute of Human Virology, Ministry of Education Key Laboratory of Tropical Disease Control, Zhongshan School of MedicineSun Yat‐Sen UniversityGuangzhouChina
4. Ministry of Education/Ministry of Health Key Laboratory of Medical Molecular VirologyInstitute of Medical MicrobiologyShanghai Medical CollegeFudan UniversityShanghaiChina