1. Department of Gynaecology, Women and Children's Hospital School of Medicine Xiamen University Xiamen Fujian Province P. R. China
2. President Office Tung Wah College Hong Kong China
3. Department of Nursing The 900th Hospital of Joint Logistic Support ForcePLA Fuzhou Fujian P. R. China
4. Department of Infection Control Zhongshan Hospital Xiamen University Xiamen Fujian Province P. R. China
5. School of Medicine Xiamen University Xiamen Fujian Province P.R. China