1. Medical Research Council Population Health Research Unit, Nuffield Department of Population Health, University of Oxford, Oxford, England
2. Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, England
3. National Institute for Health Research Oxford Biomedical Research Centre, Oxford University Hospital, Oxford, England
4. Chinese Academy of Medical Sciences, Dong Cheng District, Beijing, China
5. MRL, Merck Sharp & Dohme Corp, Boston, Masschusetts
6. Department of Epidemiology and Biostatistics, Nanjing Medical University School of Public Health, Nanjing, China
7. Department of Epidemiology and Biostatistics, Peking University Health Science Centre, Peking University, Beijing, China