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Doses of busulfan higher than the median of 700 pg/mL were found to be associated with a greater increase from baseline to 3‐month serum NfL levels (A, Mann–Whitney P = 0.037) and 6‐month percentage grey matter atrophy (B, P = 0.019). Error bars = Standard error of the mean. * signifies a P‐value ≤ 0.05.
