Simultaneous intraesophageal impedance and pH measurement of acid and nonacid gastroesophageal reflux: Effect of omeprazoleMarcelo F. Vela, Donald O. Castell, Luciana Camacho-Lobato et al.|Gastroenterology|2001Cited by 614
Twenty-Four Hour Ambulatory Simultaneous Impedance and pH Monitoring: A Multicenter Report of Normal Values From 60 Healthy VolunteersSteven S. Shay, Donald O. Castell, Talal Adhami et al.|The American Journal of Gastroenterology|2004Cited by 544
Combined Multichannel Intraluminal Impedance and Manometry Clarifies Esophageal Function Abnormalities: Study in 350 PatientsRadu Țuțuian, Donald O. Castell|The American Journal of Gastroenterology|2004Cited by 258
Nonacid Reflux in Patients With Chronic Cough on Acid-Suppressive TherapyRadu Țuțuian, Donald O. Castell, Inder Mainie et al.|CHEST Journal|2006Cited by 186
Clarification of the esophageal function defect in patients with manometric ineffective esophageal motility: studies using combined impedance-manometryRadu Țuțuian, Donald O. Castell|Clinical Gastroenterology and Hepatology|2004Cited by 184