Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Epidemiology and Biostatistics, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention (China CDC) - National Institute for Occupational Health and Poison Control and Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Epidemiology and Biostatistics