CardiaStomach NeoplasmsEsophageal NeoplasmsAdenocarcinomaEsophagogastric JunctionEsophageal AchalasiaBarrett EsophagusAfrican Continental Ancestry GroupEuropean Continental Ancestry GroupPostoperative ComplicationsRisk FactorsMetaplasiaGastrectomyFollow-Up StudiesGastroesophageal RefluxPyloric AntrumProspective StudiesIncidence