Esophageal pH MonitoringHeartburnGastroesophageal RefluxEsophagusGastric Acidity DeterminationProton Pump InhibitorsHydrogen-Ion ConcentrationManometryEsophagoscopyGastric AcidCapsule EndoscopyAntacidsMonitoring, PhysiologicRanitidineAnti-Ulcer AgentsMonitoring, AmbulatoryOmeprazoleHistamine H2 Antagonists2-PyridinylmethylsulfinylbenzimidazolesGastric JuiceStomachFamotidineMagnesium HydroxideEsophagitisLansoprazoleRabeprazoleDuodenogastric RefluxEsophagitis, PepticGastrointestinal ContentsEsomeprazoleCimetidineLaryngopharyngeal RefluxTechnetium Tc 99m DisofeninCross-Over StudiesGastrinsSulfoxidesGastric MucosaPneumonia, AspirationNizatidineGastric EmptyingDexlansoprazoleHernia, HiatalSilicic AcidDouble-Blind MethodCisaprideHydrochloric AcidBenzimidazolesFundoplication