US Department of Health and Human Services. National Institutes of Health. National Institute of Diabetes and Digestive and Kidney Diseases. Definition and facts for gastroesophageal reflux (GER) and gastroesophageal reflux disease (GERD). http://www.niddk.nih.gov/health-information/health-topics/digestive-diseases/ger-and-gerd-in-adults/Pages/definition-facts.aspx. Updated November 13, 2014. Accessed July 2016.
Katz PO, Gerson LB, Veta MF. Diagnosis and management of gastroesophageal reflux disease. Am J Gastroenterol 2013; 108:308–328; doi: 10.1038/ajg.2012.444. http://gi.org/guideline/diagnosis-and-managemen-of-gastroesophageal-reflux-disease/ http://www.gastro.org/practice/medical-position-statements. Accessed July 2016.