1. Department of Hospital Infection Control First Hospital of Quanzhou Affiliated to Fujian Medical University Quanzhou China
2. Department of Epidemiology and Health Statistics, Fujian Provincial Key Laboratory of Environment Factors and Cancer School of Public Health, Fujian Medical University Fuzhou China
3. Key Laboratory of Ministry of Education for Gastrointestinal Cancer Fujian Medical University Fuzhou China
4. Department of Gynaecology and Obstetrics The First Affiliated Hospital of Fujian Medical University Fuzhou China