This article is available in open access under Creative Common Attribution-Non-Commercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially gonoma -glucagon-producing tumour, VIPoma -vasoactive intestinal peptide (VIP) producing tumour, GHRHoma -growth hormone-releasing hormone (GHRH)-producing tumour, ACTHoma -adrenocorticotropin hormone (ACTH)-producing tumour,