Primary Squamous Cell Carcinoma of Colon and Rectum: A Systematic Review of the Literature. - Schizas D; Katsaros I; Mastoraki A; Karela NR; Zampetaki D; Lazaridis II; Tsapralis D; Theodoropoulos GE (Journal of investigative surgery : the official journal of the Academy of Surgical Research, 2022)