CD34 antigen; CD4 antigen; hemoglobin; plerixafor; SARS-CoV-2 convalescent plasma; tranexamic acid; voxelotor; age; alloimmunization; antibody response; B lymphocyte; CD4+ T lymphocyte; cesarean section; convalescent plasma therapy; coronavirus disease 2019; disease severity; erythrocyte transfusion; follow up; germinal center; hematopoietic stem cell; hemolysis; hospital patient; human; incidence; mortality; nonhuman; note; operative blood loss; postpartum hemorrhage; sample size; sickle cell anemia; stem cell mobilization