References
1. Fass R, Sifrim D. Management of heartburn not responding to proton pump inhibitors. Gut. 2009; 58:295–309.
2. Shi Y, Tan N, Zhang N, et al. Predictors of proton pump inhibitor failure in non-erosive reflux disease: a study with impedance-pH monitoring and high-resolution manometry. Neurogastroenterol Motil. 2016; 28:674–679.
3. Hershcovici T, Fass R. Management of gastroesophageal reflux disease that does not respond well to proton pump inhibitors. Curr Opin Gastroenterol. 2010; 26:367–378.
4. Kim SE, Kim N, Oh S, et al. Predictive factors of response to proton pump inhibitors in Korean patients with gastroesophageal reflux disease. J Neurogastroenterol Motil. 2015; 21:69–77.
5. Bredenoord AJ, Weusten BL, Timmer R, Conchillo JM, Smout AJ. Addition of esophageal impedance monitoring to pH monitoring increases the yield of symptom association analysis in patients off PPI therapy. Am J Gastroenterol. 2006; 101:453–459.
6. Sifrim D, Mittal R, Fass R, et al. Review article: acidity and volume of the refluxate in the genesis of gastro-oesophageal reflux disease symptoms. Aliment Pharmacol Ther. 2007; 25:1003–1017.
7. Farré R, van Malenstein H, De Vos R, et al. Short exposure of oesophageal mucosa to bile acids, both in acidic and weakly acidic conditions, can impair mucosal integrity and provoke dilated intercellular spaces. Gut. 2008; 57:1366–1374.
8. Koek GH, Sifrim D, Lerut T, Janssens J, Tack J. Effect of the GABA(B) agonist baclofen in patients with symptoms and duode-no-gastro-oesophageal reflux refractory to proton pump inhibitors. Gut. 2003; 52:1397–1402.