| Affiliation: | 1. Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China;2. Department of Obstetrics and Gynecology, Third Affiliated Hospital, Zunyi Medical College, Guizhou, China;3. Department of Histology and Embryology, Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China;4. State Key Laboratory of Ultrasound Engineering in Medicine Co‐Founded by Chongqing and the Ministry of Science and Technology, Chongqing Key Laboratory of Biomedical Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China |
