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To examine, in prostate cancer patients, the effect of (1) being offered a choice between radiation doses in three-dimensional conformal radiotherapy, and of (2) accepting or declining the possibility to choose.A total of 150 patients with localized prostate cancer (T1–3N0M0) were offered a choice with a decision aid between two radiation doses (70 and 74 Gy). A control group of 144 patients received...