Moraes-Filho, Joaquim Prado P, et al. “ Comorbidities Are Frequent in Patients With Gastroesophageal Reflux Disease in a Tertiary Health Care Hospital ”.
Clinics, vol. 64, no. 8, Jan. 2009, pp. 785-90,
https://doi.org/10.1590/S1807-59322009000800013.