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The comparison between bone mineral density (BMD) standard deviation score (z score) and that corrected for height-for-age z score (HAZ). Lumbar spine (L1-L4) BMD z score by dual energy x-ray absorptiometry (DXA) for chronological age (white bars) and that corrected for HAZ (black bars) in 26 patients with MPS I, II, IIIB, IVA and VI under 19 years of age.
