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Mean resting blood flux (RBF; A) and mean change in blood flux during inspiratory breath hold (IBH; B) expressed as a percentage change from baseline measured in African children with sickle cell (SS disease) (n= 65) and control children (n= 20) Data are expressed as the median, range and 95% confidence interval; *P= 0.002 and **P < 0.0001.
