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Calibrated normal ranges with follow-up data. Age-dependent ‘normal’ ranges of different calibrated quantitative SBRs measures with various reconstructions. The dashed line shows the linear fit of the normal data, with solid lines representing the upper and lower level normal range given by 95% confidence levels of the mean. Coloured dots represent patients suffering (red) and not suffering (green) from a syndrome characterised by dopaminergic degeneration based on 3-year follow-up
