Rectal sparing approach after preoperative radio- and/or chemotherapy (RESARCH) in patients with rectal cancer: a multicentre observational study

A. Barina, A. De Paoli, P. Delrio, M. Guerrieri, A. Muratore, F. Bianco, D. Vespa, C. Asteria, E. Morpurgo, A. Restivo, Claudio Coco, U. Pace, C. Belluco, C. Aschele, S. Lonardi, Vincenzo Valentini, G. Mantello, I. Maretto, P. Del Bianco, A. PerinS. Pucciarelli