College of Earth and Environmental Sciences;
Lanzhou University;
Lanzhou 730000;
Gansu;
China;
Department of Epidemiology and Statistics;
School of Public Health;
Lanzhou University;
Lanzhou 730000;
Gansu;
China;
Center of Medical Laboratory;
School of Basic Medical;
Lanzhou University;
Lanzhou 730000;
Gansu;
China;
Workers’Hospital of Jinchuan Group Co.;
Ltd.;
Jinchang 737100;
Gansu;
China;
Department of Epidemiology;
School of Public Health;
Brown University;
RI;
02912;
USA;