Department of Hematology,The First Affiliated Hospital of Hebei North University,075000 Zhangjiakou,Hebei,China;
Department of Physiology,Basic Medical College,Hebei North University,075000 Zhangjiakou,Hebei,China;
Department of Obstetrics and Gynecology,The Sixth Hospital of Zhangjiakou,075000 Zhangjiakou,Hebei,China;