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