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6Dymedex Market Development Consulting, Strategic Market Assessment, GERD, 30 de outubro de 2014. Referências 1-3, 6-15, 22, 23, 25 e 34 da lista de citação completa, acesse http://www.medtronic.com/giclaims
7Dymedex Market Development Consulting, GERD Sizing and Segmentation for pH Testing. 13 de fevereiro de 2015.
8Kahrilas PJ. Clinical management: Refractory heartburn. Gastroenterology. 2003;124:1941-1945.
9Vaezi M, Zehrai A, Yuksel E, Testing for refractory gastroesophageal reflux disease, ASGE Leading Edge, 2012 Vol 2, No 2, 1-13, American Society Gastroenterology Endoscopy, Página 1.