[Chen, Jihua; Liu, Wenya; Zheng, Shuilin; Wen, Cong; Feng, Xiangling; Cao, Linghui; Yang, Yue; Yang, Fei] Cent South Univ, Xiangya Sch Publ Hlth, Hunan Prov Key Lab Clin Epidemiol, Changsha 410078, Peoples R China.
[Wang, Hui; Yang, Fei; Tang, Yan] Univ South China, Sch Publ Hlth, Hunan Prov Key Lab Typ Environm Pollut & Hlth Haz, Hengyang 421001, Peoples R China.
[Tian, Li; Wang, Xiaoyan] Cent South Univ, Xiangya Hosp 3, Dept Gastroenterol, Changsha, Peoples R China.
[Yang, Fei] Southeast Univ, Key Lab Environm Med Engn, Minist Educ, Sch Publ Hlth, Nanjing 210009, Peoples R China.