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Objective: To investigate whether prognosis of breast-, colon- and prostate cancer may be related to vitamin D3, induced from solar ultra-violet (UV) radiation, through studies on geographical and seasonal variations in UV radiation. Methods: This study includes 115,096 cases of breast-, colon- or prostate cancer, diagnosed between 1964 and 1992. Among these, 45,667 deaths due to the cancer were...
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