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The fitted incidence of grade 4 xerostomia (salivary flow 25% or less relative to pre-RT) at twelve months as a function of mean dose to spared parotid gland; BCCA data. Error bars on dose values are standard deviations; error bars on incidence values are 68% confidence limits. The dashed line shows the estimated incidence of xerostomia at 20 Gy, 18%.
