Hemoglobin (Hb), Hematocrit (Hct) , Red Blood Cell(RBC), reticulocyte counts (Ret), total leucocyte (WBC), Neutrophil counts(ANC), Platelet count (Plat) were measured before and every week after the treatment.

• 两组早产儿均于治疗前、治疗后每周取静脉血测定Hb、红细胞压积(Hct)、Ret，白细胞总数(WBC)、中性粒细胞绝对值(ANC)、血小板计数(P lat);