Classic techniques like videofluoroscopy, stationary manometry, and ambulatory 24 h pH-metry are routinely used in the clinic to study patients with dysphagia, chest pain and reflux-related symptoms.

All patients underwent esophageal manometry and 24 h esophageal pH monitoring at the Gastrointestinal Motility Research Unit, Division of Gastroenterology, Department of Medicine, Faculty of Medicine, ...