Chinese Center for Disease Control and Prevention (China CDC), Chinese Center for Disease Control and Prevention (China CDC), Chinese Center for Disease Control and Prevention (China CDC), Lanzhou University, Chinese Center for Disease Control and Prevention (China CDC), Chinese Center for Disease Control and Prevention (China CDC), Chinese Center for Disease Control and Prevention (China CDC), Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Public Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Public Health and Chinese Center for Disease Control and Prevention (China CDC)

affiliation not provided to SSRN, University of Geneva - Institute of Global Health, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, American University of Beirut - Department of Internal Medicine, American University of Beirut - Clinical Research Institute, Lanzhou University, Lanzhou University, Lanzhou University, Chongqing Medical University, Lanzhou University, Lanzhou University, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - School of Public Health, Lanzhou University - School of Basic Medical Sciences and affiliation not provided to SSRN