1. Gastroesophageal reflux and asthma: are they related?;Field;J Asthma,1999
2. Gastroesophageal reflux in asthmatic patients: an incidence study and clinical correlation;Carmona Sanchez;Gac Med Mex,1999
3. Gastroesophageal reflux disease and asthma;Sontag;J Clin Gastroenterol,2000
4. Relationship between patients with bronchial asthma and symptoms of gastroesophageal reflux;Zhu;China J Tuberculosis and Respiration,2002
5. The association between gastro-oesophageal reflux disease and asthma: a systematic review;Havemann;Gut,2007