Veereman, G., Vlayen, J., Robays, J., Fairon, N., Stordeur, S., Rolfo, C., Bielen, D., Bols, A., Demetter, P., D'hoore, A., Haustermans, K., Hendlisz, A., Lemmers, A., Leonard, D., Penninckx, F., Van Cutsem, E., & Peeters, M. (2017). systematic review and meta-analysis of local resection or transanal endoscopic microsurgery versus radical resection in stage i rectal cancer: A real standard?. Critical reviews in oncology/hematology, 114, 43–52. http://access.bl.uk/ark:/81055/vdc_100046148800.0x000001