1. Ambulatory monitoring of esophageal pH and pressure;Smout, A.J.P.M.,1992
2. The symptom index: a clinically important parameter of ambulatory 24-hour esophageal pH monitoring;Weiner, G.J.; Richter, J.E.; Cooper, J.B.; Wu, W.C.; Castell, D.O.;Am J Gastroenterol,1988
3. Symptomatic gastro-oesophageal reflux, abnormal oesophageal acid exposure, and mucosal acid sensitivity are three separate, though related, aspects of gastro-oesophageal reflux disease;Howard, P.J.; Maher, L.; Pryde, A.; Heading, R.C.;Gut,1991
4. Relationship between gastroesophageal reflux and symptoms in patients referred for ambulatory pH-monitoring;Howard, P.J.; Pryde, A.; Heading, R.C.;Journal of Gastrointestinal Motility,1990
5. Symptom index as a marker of gastro-oesophageal reflux disease;Johnston, B.T.; McFarland, R.J.; Collins, J.S.A.; Love, A.H.G.;BrJSurg,1992