1. Department of Transfusion Medicine; Shanghai Huashan Hospital; Fudan University; Shanghai China
2. Department of Clinical Laboratory; Shanghai Pudong Hospital; Fudan University; Shanghai China
3. Department of Gynaecology and Obstetrics; Shanghai Pudong Hospital; Fudan University; Shanghai China
4. Department of Clinical Laboratory; Shanghai International Peace Maternity & Child Health Hospital; Jiaotong University; Shanghai China
5. Department of Clinical Laboratory; Shanghai Huashan Hospital; Fudan University; Shanghai China
6. Department of Clinical Laboratory; Shanghai First Maternity & Infant Hospital; Tongji University; Shanghai China