Moraes-Filho, Joaquim Prado P, Tomás Navarro-Rodriguez, Jaime N Eisig, Ricardo C Barbuti, Decio Chinzon, and Eamonn M M Quigley. 2009. “ Comorbidities Are Frequent in Patients With Gastroesophageal Reflux Disease in a Tertiary Health Care Hospital ”. Clinics 64 (8): 785-90. https://doi.org/10.1590/S1807-59322009000800013.