1. Department of Obstetrics and Gynecology; Drum Tower Hospital, Medical School of Nanjing University; Nanjing Jiangsu China
2. Department of Medical Genetics, Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University; Nanjing Jiangsu China
3. Centre of Prenatal Diagnosis of Jiangsu Province, Drum Tower Hospital; Medical School of Nanjing University; Nanjing Jiangsu China