1. School of MedicineNankai University 300071 Tianjin China
2. Nankai University Second People’s Hospital, School of MedicineNankai University 300071 Tianjin China
3. State Key Laboratory of Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and PreventionCollaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases 102206 Beijing China
4. Department of Immunology and Microbial ScienceThe Scripps Research Institute 92037 La Jolla CA USA