1. Department of Obstetrics and Gynecology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China
2. Department of Pharmacy, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
3. Institute of Ultrasound Imaging, the Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China