Biliary Tract Surgical ProceduresPancreaticoduodenectomyBiliary Tract NeoplasmsBiliary Tract DiseasesBiliary TractPancreatic FistulaAmpulla of VaterPancreaticojejunostomyCommon Bile Duct NeoplasmsPancreatic NeoplasmsDuodenal NeoplasmsPancreatic DiseasesPostoperative ComplicationsPancreatectomyJejunostomyGallbladder NeoplasmsTreatment OutcomeBile Duct NeoplasmsPylorusPancreatic DuctsCholangiocarcinomaAdenocarcinomaDrainageAnastomosis, SurgicalRetrospective StudiesCarcinoma, Pancreatic DuctalGastroparesisPancreasSurgical Procedures, OperativeCommon Bile DuctDuodenumGastric EmptyingDigestive System AbnormalitiesMesenteric VeinsBile DuctsRetroperitoneal SpaceGallstonesBiliary FistulaCholelithiasisBile Ducts, ExtrahepaticCholecystectomyAnastomosis, Roux-en-YPreoperative CarePostoperative CareGastrostomyCholangiopancreatography, Endoscopic RetrogradeBile Ducts, IntrahepaticTime FactorsCholangitisGallbladderDuodenoscopyCeliac ArteryDigestive System NeoplasmsPancreatic JuiceLength of StayPancreatitis, ChronicAbdominal AbscessTomography, X-Ray ComputedDuodenostomyHepatic ArteryPancreatitisFollow-Up StudiesSuture TechniquesProspective StudiesGastroenterostomySurvival RateReconstructive Surgical ProceduresCholedochostomyBileReoperationCholecystitisCholestasisSplenic VeinOrgan Sparing TreatmentsPortal VeinJaundice, ObstructiveDigestive System Surgical ProceduresPostoperative HemorrhageRisk FactorsCholangiographyAneurysm, FalseIntubation, GastrointestinalAdenocarcinoma, MucinousIntraoperative PeriodCarcinomaSurgical Procedures, MinorDuodenal DiseasesChi-Square DistributionSomatostatinomaBile Duct DiseasesNutritional SupportBlood Loss, SurgicalPostoperative PeriodLaparoscopyConstriction, PathologicAdenoma, Islet CellSurgical Wound Infection