Junjie Xu1, Weiming Tang2, Fujie Zhang3, Hong Shang4. 1. National Health Commission Key Laboratory of AIDS Immunology, Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, China; Key Laboratory of AIDS Immunology of Liaoning Province, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, China; Key Laboratory of AIDS Immunology, Chinese Academy of Medical Sciences, Shenyang, Liaoning, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, Zhejiang, China. 2. University of North Carolina Project-China, Guangzhou, Guangdong, China. 3. Beijing Ditan Hospital, Capital Medical University, Beijing, China. 4. National Health Commission Key Laboratory of AIDS Immunology, Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, China; Key Laboratory of AIDS Immunology of Liaoning Province, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, China; Key Laboratory of AIDS Immunology, Chinese Academy of Medical Sciences, Shenyang, Liaoning, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, Zhejiang, China. Electronic address: hongshang100@hotmail.com.