Qingdao University, Capital Medical University - Department of Infectious Diseases, Qingdao University, Capital Medical University - Department of Infectious Diseases, Government of the People's Republic of China - China-Japan Friendship Hospital, Tianjin University, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Peking Union Medical College Hospital, Capital Medical University - Department of Infectious Diseases, Sun Yat-sen University (SYSU) - School of Public Health, Capital Medical University - Clinical and Research Center for Infectious Diseases, Qingdao University and Capital Medical University - Clinical and Research Center for Infectious Diseases