Prognostic impact of the lymph node metastatic ratio on 5-year survival of patients with rectal cancer not submitted to preoperative chemoradiation - Jacomo, Alfredo Luiz; Martinez, Carlos Augusto Real; Serra, Marcia Milena Pivatto; Akamatsu, Flávia Emi; Pereira, José Aires; Andrade, Mauro Figueiredo Carvalho de; Margarido, Nelson Fontana (Journal of Coloproctology, 2011)