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Kaplan-Meier plot of morbidity after 13 Gy whole thorax irradiation (WTI) with and without 30 Gy irradiation to the skin. Numbers in the parentheses indicate the number of rats at risk at 70 days after irradiation. Radiation to the skin at 3 hours after WTI protects rats from morbidity due to radiation pneumonitis.
