1. Department of Obstetrics and Gynaecology Peking University First Hospital Beijing China
2. Obstetrics and Gynecology Department, Hospital Universitario de Torrejón, Torrejón de Ardoz Madrid Spain
3. School of Medicine Universidad Francisco de Vitoria (UFV), Pozuelo de Alarcón Madrid Spain
4. Department of Gynaecology and Obstetrics, Tongji Hospital, Tongji Medical College Huazhong University of Science & Technology Wuhan China
5. Department of Gynaecology and Obstetrics Zhongnan Hospital of Wuhan University Wuhan China
6. Clinical Medicine Research Center of Prenatal Diagnosis and Birth Health in Hubei Province Wuhan China
7. Department of Obstetrics and Gynaecology, Prince of Wales Hospital The Chinese University of Hong Kong Hong Kong SAR
8. Harris Birthright Centre Fetal Medicine Research Institute, King's College Hospital, King's College London London UK