Yagmur, Yusuf, Nilgün Söğutcü, and Serdar Gümüş. 2020. “Recent Classifications Systems for Gastroenteropancreatic Neuroendocrine Tumors. A Single-Center Experience”. Annali Italiani Di Chirurgia 91 (6):598-604. https://annaliitalianidichirurgia.it/index.php/aic/article/view/2589.