Andrea Frilling1, Ken Herrmann2, Daniel Kämmerer3, Christos Toumpanakis4. 1. Department of Surgery and Cancer, Imperial College London, Hammersmith Campus, London, UK. 2. Department of Nuclear Medicine, University Hospital Essen, Essen, Germany. 3. Department of General and Visceral Surgery, Zentralklinik Bad Berka, Bad Berka, Germany. 4. Centre for Gastroenterology|Neuroendocrine Tumour Unit, ENETS Centre of Excellence, Royal Free Hospital, London, UK.