RT Journal Article SR Electronic T1 Impedance-pH monitoring in proton pump inhibitor resistant patients: ready for clinical application? JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1379 OP 1381 DO 10.1136/gut.2006.098806 VO 55 IS 10 A1 J P Galmiche YR 2006 UL http://gut.bmj.com/content/55/10/1379.abstract AB