Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, affiliation not provided to SSRN, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health and Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Division of Prevention and Community Health