1. Department of Blood Transfusion Dongguan Maternal and Child Health Hospital Dongguan China
2. Institute of Clinical Blood Transfusion Guangzhou Blood Center Guangzhou China
3. Department of obstetrics Dongguan Maternal and Child Health Hospital Dongguan China
4. Department of Critical Care Medicine Dongguan Maternal and Child Health Hospital Dongguan China
5. Department of Blood Transfusion Affiliated Tungwah Hospital of Sun yat‐sen University Dongguan China
6. Blood Transfusion Research Center Dongguan City Blood Station Dongguan China