1 State Key Laboratory of Vaccines for Infectious Diseases, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences & School of Public Health Xiamen University Xiamen Fujian China.
2 Clinical Center for Bio-Therapy, Zhongshan Hospital Fudan University (Xiamen Branch) Xiamen Fujian China.
3 State Key Laboratory of Emerging Infectious Diseases, School of Public Health, Li Ka Shing Faculty of Medicine The University of Hong Kong Hong Kong SAR China.