Figure 1From: A proposal for reducing the effect of one of many causes of publication bias Randomization structure showing the number of patients allocated to each of the three treatments (Venesection, P32 and Busulphan) and the method of treatment allocation in each phase of the trial. V n1 , P n2 and B n3 indicate that n 1 patients were allocated to Venesection, n 2 to P32 and n 3 to Busulphan.Back to article page