1. Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou 510515, PR China
2. Department of Obstetrics, He Xian Memorial Affiliated Hospital of Southern Medical University, Guangzhou 511402, China
3. Department of Laboratory Medicine, The Second Hospital of Chinese Medicine in Guangdong, Guangzhou, 510095, China
4. Shenzhen Bao'an District Central Blood Station, Shenzhen, PR China