London School of Hygiene & Tropical Medicine - Department of Clinical Research, University of North Carolina Project-China, London School of Hygiene & Tropical Medicine - Department of Clinical Research, The University of Hong Kong, Alfred Health - Melbourne Sexual Health Centre, University of Sheffield, Duke University, London School of Hygiene & Tropical Medicine - Centre for Mathematical Modelling of Infectious Diseases, London School of Hygiene & Tropical Medicine - Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine - Faculty of Public Health and Policy, London School of Hygiene & Tropical Medicine - Department of Infectious Disease Epidemiology, The Bill & Melinda Gates Foundation - Beijing Representative Office, Peking University - Institute of Population Research, University of North Carolina (UNC) at Chapel Hill - Project-China, University of North Carolina Project-China, Jinan University, Zhuhai Center for Disease Control and Prevention, Guangdong Second Provincial General Hospital, Yangshan Health Centre - Vaccination Clinic, Fenghuang Community Health Service Centre, Xinhua Community Health Service Centre, Community Representative, Guangzhou, China, Guangdong Second Provincial General Hospital, University of North Carolina Project-China and University of North Carolina (UNC) at Chapel Hill - Division of Infectious Disease

City University of Macau, City University of Macau, City University of Macau, National University of Singapore (NUS) - Duke-NUS Medical School, Boston University, Zhuhai Center for Disease Control and Prevention, Sun Yat-sen University (SYSU), Nanjing Medical University, Jinan University, Alfred Health - Melbourne Sexual Health Centre, The University of Hong Kong - Department of Family Medicine and Primary Care, The University of Hong Kong, University of North Carolina Project-China and University of Oxford - Nuffield Department of Medicine