For the Dutch Colorectal Cancer Group*From the Departments of Surgery (E.K., C.J.H.V.), Clinical Oncology (C.A.M.M.), and Medical Statistics (H.P.), Leiden University Medical Center, Leiden; the Departments of Pathology (I.D.N., J.H.J.M.K.) and Radiotherapy (J.W.H.L.), University Medical Center St. Radboud, Nijmegen; the Department of Surgery, Leyenburg Hospital, The Hague (W.H.S.); the Department of Surgery, University Hospital Groningen, Groningen (T.W.); and the Department of Surgery, Catharina Hospital, Eindhoven (H.J.T.R.) - all in the Netherlands; and the Departments of Surgery (L.P.) and Oncology (B.G.), Akademiska Sjukhuset, Uppsala, Sweden. Address reprint requests to Dr. van de Velde at the Department of Surgery K6-R, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, the Netherlands, or at velde@lumc.nl.*Other participating investigators are listed in the Appendix.
