Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Obstetrics, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Department of Radiology, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Huazhong University of Science and Technology - Maternal and Child Health Hospital of Hubei Province and Huazhong University of Science and Technology - Maternal and Child Health Hospital of Hubei Province

Soochow University - Department of Epidemiology and Health Statistics, Huazhong University of Science and Technology - Maternal and Child Health Hospital of Hubei Province, Haidian Maternal & Child Health Hospital, Chinese Academy of Medical Sciences - National Research Institute for Family Planning, Soochow University - Department of Obstetrics and Gynecology, Maternal and Child Health Hospital of Hubei Province - Department of Obstetrics, Soochow University - Department of Epidemiology and Health Statistics, Haidian Maternal & Child Health Hospital, Women and Children Health Care Center of Taicang, Haidian Maternal & Child Health Hospital, Soochow University - Department of Epidemiology and Health Statistics, Haidian Maternal & Child Health Hospital, Soochow University - Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases and National Research Institute for Family Planning