1)Iwakiri K, Kawami N, Sano H, et al:Mechanisms of excessive esophageal acid exposure in patients with reflux esophagitis. Dig Dis Sci 54:1686-1692,2009
2)Johnson LF, DeMeester TR:Twenty-four-hour pH monitoring of the distal esophagus. A quantitative measure of gastroesophageal reflux. Am J Gastroenterol 62:325-332,1974
3)Dinelli M, Passaretti S, Di Francia I, et al:Area under pH 4:a more sensitive parameter for the quantitative analysis of esophageal acid exposure in adults. Am J Gastroenterol 94:3139-3144,1999
4)Martinez SD, Malagon IB, Garewal HS, et al:Non-erosive reflux disease (NERD)--acid reflux and symptom patterns. Aliment Pharmacol Ther 17:537-545,2003
5)Wiener GJ, Richter JE, Copper JB, et al:The symptom index:a clinically important parameter of ambulatory 24-hour esophageal pH monitoring. Am J Gastroenterol 83:358-361,1988
6)Breumelhof R, Smout AJ:The symptom sensitivity index:a valuable additional parameter in 24-hour esophageal pH recording. Am J Gastroenterol 86:160-164,1991
7)Lam HG, Breumelhof R, Roelofs JM, et al:What is the optimal time window in symptom analysis of 24-hour esophageal pressure and pH data? Dig Dis Sci 39:402-409,1994
8)Charbel S, Khandwala F, Vaezi MF:The role of esophageal pH monitoring in symptomatic patients on PPI therapy. Am J Gastroenterol 100:283-289,2005
9)Bredenoord AJ, Tutuian R, Smout AJ, et al:Technology review:Esophageal impedance monitoring. Am J Gastroenterol 102:187-194,2007
10)Mainie I, Tutuian R, Shay S, et al:Acid and non-acid reflux in patients with persistent symptoms despite acid suppressive therapy:a multicentre study using combined ambulatory impedance-pH monitoring. Gut 55:1398-1402,2006
11)Hirano I, Zhang Q, Pandolfino JE, et al:Four-day Bravo pH capsule monitoring with and without proton pump inhibitor therapy. Clin Gastroenterol Hepatol 3:1083-1088,2005
12)Wong WM, Bautista J, Dekel R, et al:Feasibility and tolerability of transnasal/per-oral placement of the wireless pH capsule vs. traditional 24-h oesophageal pH monitoring--a randomized trial. Aliment Pharmacol Ther 21:155-163,2005
13)Pandolfino JE, Bianchi LK, Lee TJ, et al:Esophagogastric junction morphology predicts susceptibility to exercise-induced reflux. Am J Gastroenterol 99:1430-1436,2004