Introduction of preoperative radiotherapy in the treatment of operable rectal cancer in the Southwest region of the Netherlands

M. Vermaas, M. P. Gosselink, F. T.J. Ferenschild, E. van den Aardweg, H. E. Lont, H. W.P.M. Kemperman, E. van der Harst, G. W.M. Tetteroo, R. J. Oostenbroek, C. M. Dijkhuis, A. M.M. Eggermont, J. H.W. de Wilt