RicciC.; MonariF.; BuscemiS.; D’AmbraM.; CampanaD.; PanzacchiR.; CeccarelliC.; LabombardaM.; TaffurelliG.; SantiniD.; TomassettiP.; PezzilliR.; CasadeiR.; MinniF. Lymph Node Ratio As a Prognostic Factor in Patients With Pancreatic Endocrine Tumours. JOP 2012, 13, 635.