Decline in radiotherapy spells decline in thyroid cancer.
D000328:Adult; D002648:Child; D006801:Humans; D015994:Incidence; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology*; D011878:Radiotherapy / Q000009:adverse effects*; D013964:Thyroid Neoplasms / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology