Barrett EsophagusEsophagusMetaplasiaEsophageal NeoplasmsPrecancerous ConditionsAdenocarcinomaGenes, MCCCardiaGastroesophageal RefluxEndoscopy, GastrointestinalEsophagoscopyEsophagogastric JunctionEsophagectomyMucous MembraneDisease ProgressionHernia, HiatalImmunohistochemistryEsophageal DiseasesPharmacy AdministrationEsophageal StenosisEndoscopyEsophagoplastyBiopsyChromosomes, Human, Pair 5EsophagitisChromosomes, Human, Pair 17Stomach NeoplasmsPolymerase Chain ReactionEsophagitis, PepticTumor Markers, BiologicalEsophageal PerforationPeristalsisLoss of HeterozygositySensitivity and SpecificityManometryEsophageal FistulaCarcinoma, Squamous Cell