1. Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health University of Oxford Oxford UK
2. Medical Research Council Population Health Research Unit (MRC PHRU), Nuffield Department of Population Health University of Oxford Oxford UK
3. Chinese Academy of Medical Sciences Beijing China
4. NCDs Prevention and Control Department Liuzhou CDC Liuzhou China
5. NCDs Prevention and Control Department Henan CDC Zhengzhou China
6. Department of Epidemiology and Biostatistics School of Public Health, Peking University Beijing China