Bile RefluxDuodenogastric RefluxGastroesophageal RefluxBileBile Acids and SaltsPostgastrectomy SyndromesGastritisBarrett EsophagusEsophagusVesico-Ureteral RefluxAnastomosis, Roux-en-YBiliary Tract DiseasesManometryBile DuctsStomachGastric JuiceGastric MucosaEsophagitis, PepticPyloric AntrumFatty AcidsMetaplasiaLaryngopharyngeal RefluxDyspepsiaHelicobacter pyloriBilirubinHelicobacter InfectionsEsophageal pH Monitoring