Institution: | 1. Department of Obstetrics, the Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
Fetal Medicine Center, Department of Obstetrics, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China;2. Fetal Medicine Center, Department of Obstetrics, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China;3. Guangzhou Blood Center, Insititute of Clinical Blood Transfusion, Guangzhou, China;4. Department of Obstetrics, the Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China |