1. Sobieraj DM, Coleman SM, Coleman CI. US prevalence of upper gastrointestinal symptoms: A systematic review. Am J Mang Care. 2011;17:e449–45.
2. Watson DI, Lally CJ. Prevalence of symptoms and use of medication for gastroesophageal reflux disease in an Australian community. World J Surg. 2009;33:88–94.
3. Fedorak RN, Veldhuyzen van Zanten S, Bridges R. Canadian Digestive Health Foundation Public Impact Series: gastroesophageal reflux disease in Canada: incidence, prevalence, and direct and indirect economic impact. Can J Gastroenterol. 2010;24:431–4.
4. Yuen E, Romney M, Toner RW, et al. Prevalence, knowledge and care patterns for gastro-oesophageal reflux disease in United States minority populations. Aliment Pharmacol Ther. 2010;32:645–54.
5. Gisbert JP, Cooper A, Karagiannis D, et al. Consultation rates and characteristics of gastro-oesophagel reflux disease in primary care: a European observational study. Eur J Gen Pract. 2009;15:154–60.