Bile RefluxDuodenogastric RefluxGastroesophageal RefluxBileBile Acids and SaltsPostgastrectomy SyndromesGastritisBarrett EsophagusEsophagusVesico-Ureteral RefluxAnastomosis, Roux-en-YBiliary Tract DiseasesManometryBile DuctsStomachGastric JuiceEsophagitis, PepticGastric MucosaPyloric AntrumMetaplasiaLaryngopharyngeal RefluxDyspepsiaBilirubinHelicobacter pyloriHelicobacter InfectionsEsophageal pH Monitoring