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The following sentence has been amended to read: The average white blood cell count for all patients was 3.8 ×10⁹/L (range 0.1–23.7 ×10⁹/L). The average haemoglobin was 91 g/L (range 54–135 g/L). The average platelet count was 146 ×10⁹/L (range 4–642 ×10⁹/L).