Tiensuu Janson, E.; Knigge, U.; Dam, G.; Federspiel, B.; Grønbaek, H.; Stålberg, P.; Langer, S. W.; Kjaer, A.; Arola, J.; Schalin-Jäntti, C. Nordic Guidelines 2021 for Diagnosis and Treatment of Gastroenteropancreatic Neuroendocrine Neoplasms. AO 2021, 60, 931-941.