1. State Key Laboratory of Maternal and Fetal Medicine of Chongqing Municipality, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
2. Department of Obstetrics, Peking University Third Hospital, Beijing 100191, China
3. Department of Obstetrics, The Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
4. Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China
5. Department of Obstetrics, Women and Children’s Hospital of Chongqing Medical University, Chongqing 401147, China
6. College of Life Sciences, University of Leicester, Leicester LE1 7RH, UK