24-hour esophageal pH monitors.
D004947:Esophagus; D005744:Gastric Acid / Q000378:metabolism*; D005745:Gastric Acidity Determination; D005764:Gastroesophageal Reflux; D006801:Humans; D008991:Monitoring, Physiologic / Q000639:trends*; D013673:Technology Assessment, Biomedical; D014481:United States