Barrett EsophagusEsophagusMetaplasiaEsophageal NeoplasmsPrecancerous ConditionsAdenocarcinomaGenes, MCCCardiaGastroesophageal RefluxEndoscopy, GastrointestinalEsophagoscopyEsophagogastric JunctionEsophagectomyMucous MembraneDisease ProgressionHernia, HiatalImmunohistochemistryEsophageal DiseasesPharmacy AdministrationEsophageal StenosisEndoscopyEsophagoplastyBiopsyEsophagitisChromosomes, Human, Pair 5Chromosomes, Human, Pair 17Stomach NeoplasmsEsophagitis, PepticEsophageal PerforationPeristalsisLoss of HeterozygosityManometryTumor Markers, BiologicalEsophageal FistulaCarcinoma, Squamous Cell