Gastrointestinal HemorrhagePeptic Ulcer HemorrhageMelenaHematemesisMallory-Weiss SyndromeHemorrhageDuodenal DiseasesCerebral HemorrhageEsophageal and Gastric VaricesSubarachnoid HemorrhageBrunner GlandsEndoscopyEndoscopy, GastrointestinalEsophageal DiseasesStomach UlcerStomach DiseasesGastroscopyHemostatic TechniquesHemostasis, EndoscopicGastropexyMeckel DiverticulumIntracranial HemorrhagesIleal DiseasesDuodenal UlcerHypertension, PortalPeptic UlcerHemobiliaJejunal NeoplasmsRetinal HemorrhageDouble-Balloon EnteroscopyFiber Optic TechnologySplenic ArteryVascular MalformationsUlcerAcute DiseaseBarium SulfateAngiographyEmergenciesGastric FistulaEmbolization, TherapeuticPostpartum HemorrhageJejunal DiseasesDuodenal NeoplasmsTreatment Outcome