Derya Kıvrak Salim, et al. “Palliative Resection of Primary Site in Advanced Gastroenteropancreatic Neuroendocrine Tumors Improves Survivals”. Turkish Journal of Gastroenterology, vol. 30, no. 10, Oct. 2019, pp. 910-6, https://tjg.avesjournals.com/index.php/tjg/article/view/3789.