GastrectomyAnastomosis, Roux-en-YPostgastrectomy SyndromesStomach NeoplasmsEsophagostomyGastroenterostomyZollinger-Ellison SyndromeJejunostomyJejunumDuodenostomyEsophagusLinitis PlasticaSurgical StaplersAnastomosis, SurgicalJejunal DiseasesLymph Node ExcisionStomachGastroscopySurgical EquipmentLaparoscopyPostoperative ComplicationsDuodenumSplenectomyGastrinsCarcinoma, Signet Ring CellGastric StumpStomach DiseasesPancreatectomyAdenocarcinomaEsophagoplastyGastric EmptyingLevoleucovorinNeoplasm Regression, SpontaneousReconstructive Surgical ProceduresEsophagitis, PepticCardiaTreatment OutcomePolypsEsophageal FistulaRetrospective StudiesOxonic AcidCholecystokininLymphatic MetastasisTegafurLeiomyosarcomaDumping SyndromeNeoplasm StagingObesity, MorbidSurvival RateTime FactorsSerous MembraneFollow-Up StudiesVagotomyPrognosisLength of StayEsophageal NeoplasmsStomach UlcerBariatric SurgeryChemotherapy, AdjuvantNeoplasm Recurrence, LocalPylorusChi-Square DistributionTomography, X-Ray ComputedSurgical Wound InfectionGastric Bypass