Department of Epidemiology;
School of Public Health;
Medical College of Soochow University;
Suzhou 215123;
Jiangsu;
China;
Suzhou Industrial Park Centers for Disease Control and Prevention (Institute of Health Inspection and Supervision);
Suzhou 215021;
Jiangsu;
China;
Department of Health Care;
Xiamen Maternal and ChiM Care Hospital;
Xiamen 361000;
Fujian;
China;