Postoperative pelvic radiotherapy with or without elective irradiation of para-aortic nodes and liver in rectal cancer patients. A controlled clinical trial of the EORTC Radiothera... von Bosset, J F, Horiot, J C, Hamers, H P, Cionini, L, Bartelink, H, Caspers, R, Untereiner, M, Ciambelloti, E, Pierart, M, Van Glabbeke, M

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