“Systemic Therapies in Metastatic Pancreatic Neuroendocrine Neoplasms (PNENs): Is There a Right Sequence? A Case Report and Review of the Literature”. European Journal of Oncology and Environmental Health, vol. 20, no. 1, Mar. 2016, pp. 75-81, https://mattioli1885journals.com/index.php/EJOEH/article/view/4275.