GastroenterostomyJejunostomyGastric BypassGastrostomySurgical StaplersAnastomosis, Roux-en-YGastric Outlet ObstructionDuodenostomyJejunumVagotomyDuodenogastric RefluxAmpulla of VaterJejunal DiseasesDuodenal NeoplasmsCommon Bile Duct NeoplasmsGastrectomyStomach VolvulusStomachDumping SyndromeBile RefluxNatural Orifice Endoscopic SurgeryGastric EmptyingPyloric AntrumDuodenal UlcerPostoperative ComplicationsGastric JuiceLaparoscopyEnteral NutritionObesity, MorbidNeoplasms, Multiple PrimaryDuodenumStomach NeoplasmsPalliative CarePancreatic NeoplasmsLength of StayReoperationAdenocarcinomaTime FactorsTreatment OutcomeFollow-Up StudiesProspective StudiesSurvival Rate