Fig. 2

a A funnel plot of the Hb drop. b A funnel plot of the blood loss. c A funnel plot of the transfusion rate. d A funnel plot of the complications. e A funnel plot of the length of hospital stay
a A funnel plot of the Hb drop. b A funnel plot of the blood loss. c A funnel plot of the transfusion rate. d A funnel plot of the complications. e A funnel plot of the length of hospital stay