Figure 1.

Patient flow-chart, resulting in the National population, including patients diagnosed in all of Sweden, and the Regional population, covering the subgroup of patients diagnosed at Sahlgrenska University Hospital in Gothenburg. GEP-NET: gastroenteropancreatic neuroendocrine tumours. *Patients with grade 3 tumours were excluded based on a comparison of the survival (via Kaplan-Meier curves and log-rank tests) for patients with morphological codes suggestive of grade 3 tumours in relation to the survival among patients with other morphological codes. Morphological codes 80413 and 82463 were excluded (patients with these morphological codes had a markedly poorer overall survival compared to the other patients; p<0.0001 in both analyses).