Tiensuu Janson, Eva, Ulrich Knigge, Gitte Dam, Birgitte Federspiel, Henning Grønbaek, Peter Stålberg, Seppo W. Langer, et al. 2021. “Nordic Guidelines 2021 for Diagnosis and Treatment of Gastroenteropancreatic Neuroendocrine Neoplasms”. Acta Oncologica 60 (7):931-41. https://doi.org/10.1080/0284186X.2021.1921262.