Kollár, Attila, Annika Blank, Aurel Perren, Lukas Bütikofer, Christoph Stettler, and Emanuel Christ. “Additional Malignancies in Patients With Neuroendocrine Tumours: Analysis of the SwissNET Registry”. Swiss Medical Weekly 146, no. 4546 (November 6, 2016): w14362. Accessed April 24, 2024. https://smw.ch/index.php/smw/article/view/2243.