"Single-nucleotide polymorphisms FOXF1 rs9936833 and MHC rs9257809 remained significantly associated with presence of gastroesophageal acid reflux. The association for risk allele C in FOXF1 rs9936833 and risk allele A in MHC rs9257809 with the presence of acid reflux suggests a potential pathophysiologic mechanism for the role of genetic influences in Barret Esophagus development."xsd:string