PancreaticoduodenectomyPancreatic FistulaPancreaticojejunostomyAmpulla of VaterCommon Bile Duct NeoplasmsPancreatic NeoplasmsDuodenal NeoplasmsPancreatectomyPancreatic DiseasesPylorusPostoperative ComplicationsCarcinoma, Pancreatic DuctalGastroparesisJejunostomyPancreatic DuctsAdenocarcinomaPancreasGastric EmptyingMesenteric VeinsDigestive System AbnormalitiesAnastomosis, SurgicalRetroperitoneal SpaceDuodenumTreatment OutcomeDrainageGastrostomyDuodenoscopyCeliac ArteryPancreatitis, ChronicAbdominal AbscessDuodenostomyRetrospective StudiesPostoperative CarePreoperative CarePancreatic JuiceAnastomosis, Roux-en-YGastroenterostomyLength of StaySplenic VeinOrgan Sparing TreatmentsBiliary Tract Surgical ProceduresSuture TechniquesHepatic ArteryAdenocarcinoma, MucinousIntubation, GastrointestinalAneurysm, FalseDigestive System NeoplasmsTomography, X-Ray ComputedSomatostatinomaBile Duct NeoplasmsDuodenal DiseasesNutritional SupportAdenoma, Islet CellBiliary FistulaCommon Bile DuctSurvival RatePortal VeinMesenteric Artery, SuperiorPostoperative HemorrhageTime FactorsPancreatitisRenal VeinsIntraoperative PeriodEndosonographyAdenocarcinoma, PapillaryJaundice, ObstructiveEnteral NutritionHospitals, Low-VolumeProspective StudiesBile DuctsOctreotideBlood Loss, SurgicalChi-Square DistributionReconstructive Surgical Procedures