title: Reply to the editor.
authors.affiliation: Department of Chest, Assiut University Hospital, Assiut University, Assiut, Egypt. E-mail: hamakhlouf@yahoo.com.
authors.forename: Ali A
authors.initials: AA
authors.lastname: Hasan
authors.affiliation: Department of Chest, Assiut University Hospital, Assiut University, Assiut, Egypt. E-mail: hamakhlouf@yahoo.com.
authors.forename: Hoda A
authors.initials: HA
authors.lastname: Makhlouf