Erratum to: One-level step section histological analysis is insufficient to confirm complete pathological response after neoadjuvant chemoradiation for rectal cancer. - Pereira MA; Dias AR; Faraj SF; Nahas CSR; Imperiale AR; Marques CFS; Cotti GC; Azevedo BC; Nahas SC; de Mello ES; Ribeiro U Jr (Techniques in coloproctology, 2017)