1. Department of Obstetrics, Maternity and Child Health Hospital of Zhenjiang, Zhenjiang, Jiangsu 212001, P.R. China
2. Department of Nursing, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
3. Department of Computed Tomography, Maternity and Child Health Hospital of Zhenjiang, Zhenjiang, Jiangsu 212001, P.R. China
4. Central Laboratory of Medicine, Maternity and Child Health Hospital of Zhenjiang, Zhenjiang, Jiangsu 212001, P.R. China
5. New Drug Screening Center, Jiangsu Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing, Jiangsu 210009, P.R. China