1. Department of Cardiovascular Ultrasound; The First Hospital of China Medical University; Shenyang China
2. Department of Ultrasound; No.202 Hospital of PLA; Shenyang China
3. Genetic Disease Laboratory; Dalian Maternal and Child Health Care Hospital; Dalian China
4. Genetic Disease Laboratory; Zibo Maternal and Child Health Hospital; Zibo China
5. Gynaecology and Obstetrics; Shengjing Hospital of China Medical University; Shenyang China