title: Study of respiratory disorders in endoscopically negative and positive gastroesophageal reflux disease.
authors.affiliation: Pulmonary Unit, Department of Internal Medicine, Mansoura University, Mansoura, Egypt. mahamaher66@hotmail.com
authors.forename: Maha M
authors.initials: MM
authors.lastname: Maher
authors.forename: Amr A
authors.initials: AA
authors.lastname: Darwish