InsulinomaOccult BloodAdenoma, Islet CellPancreatic NeoplasmsIslets of LangerhansInsulinNesidioblastosisHypoglycemiaInsulin-Secreting CellsProinsulinGlucoseColonoscopyPancreatectomyGlucose Transporter Type 2Tumor Cells, CulturedSigmoidoscopyGroup VI Phospholipases A2GlucagonomaCalcium GluconateNeoplasms, Unknown PrimaryOctreotideMass ScreeningColorectal NeoplasmsTolbutamideReceptors, GlucagonReceptor-Like Protein Tyrosine Phosphatases, Class 8Proprotein Convertase 2SecretagoginsMultiple Endocrine Neoplasia Type 1