[1] Sichuan Univ, West China Sch Publ Hlth, 16,Sect 3,Renmin South Rd, Chengdu 610041, Sichuan, Peoples R China
[2] Sichuan Univ, West China Fourth Hosp, 16,Sect 3,Renmin South Rd, Chengdu 610041, Sichuan, Peoples R China
[3] Guizhou Med Univ, Sch Publ Hlth, Key Lab Environm Pollut Monitoring & Dis Control, Minist Educ, Guiyang 550025, Guizhou, Peoples R China
[4] Kunming Med Univ, Kunming, Yunnan, Peoples R China
[5] Baoshan Coll Tradit Chinese Med, Baoshan, Yunnan, Peoples R China
[6] Chongqing Ctr Dis Control & Prevent, Chongqing, Peoples R China
[7] Chengdu Med Coll, Affiliated Women & Childrens Hosp, Sichuan Prov Hosp Women & Children, Chengdu, Sichuan, Peoples R China
[8] Chengdu Ctr Dis Control & Prevent, Chengdu, Sichuan, Peoples R China
[9] Tibet Ctr Dis Control & Prevent, Lhasa, Tibet, Peoples R China
[10] Tibet Univ, Sch Med, High Altitude Med Res Ctr, Lhasa, Tibet, Peoples R China