Barrett EsophagusEsophagusMetaplasiaEsophageal NeoplasmsPrecancerous ConditionsAdenocarcinomaGenes, MCCCardiaGastroesophageal RefluxEndoscopy, GastrointestinalEsophagoscopyDisease ProgressionEsophagogastric JunctionEsophagectomyMucous MembraneHernia, HiatalImmunohistochemistryPharmacy AdministrationEndoscopyChromosomes, Human, Pair 5Esophageal DiseasesChromosomes, Human, Pair 17BiopsyLoss of HeterozygosityEsophageal StenosisStomach NeoplasmsTumor Markers, Biological