DissectionEndoscopy, GastrointestinalGastroscopyGastric MucosaEndoscopyGastroscopesStomach NeoplasmsEndoscopes, GastrointestinalElectrocoagulationSurgical InstrumentsPostoperative HemorrhageNarrow Band ImagingDigestive System FistulaGastrointestinal NeoplasmsGastroenterologyEsophagoscopyIntestinal PerforationRepublic of KoreaTreatment OutcomeGastrectomyAdenocarcinomaIntestinal MucosaEsophageal NeoplasmsAdenomaAneurysm, DissectingEquipment DesignFeasibility StudiesRetrospective StudiesJapanNeck DissectionEsophagusTime FactorsAortic AneurysmColonoscopyCarotid Artery, Internal, DissectionEndoscopy, Digestive SystemEndosonographyVertebral Artery DissectionSubmucous PlexusExocrine GlandsAortic Aneurysm, ThoracicLymph Node ExcisionProspective Studies