Management of malignant colon and rectal polyps (T1) after endoscopic polypectomy: analysis of pathological risk factors for lymph nodes metastasis. A retrospective multicentric observational study. POST-1 (Polypectomy Or Surgery for T1). Issue 2 (February 2019) - Parini, D.; Saadeh, L.; Zizzo, M.; Sancho-Muriel, J.; Lorenzon, L.; Turati, L.; Tutino, R.; Mellano, A.; Gallo, G.; Rizzo, G.; Morino, M.; Allaix, M.E.; et al.