1. Department of Chest Diseases, Faculty of Medicine, Assiut University, Assiut, Egypt
2. Faculty of Nursing, Assiut University, Assiut, Egypt
3. Department of Public Health and community medicine, Faculty of Medicine, Assiut University, Assiut, Egypt
4. Department of Tropical Medicine and Gastroenterology, Faculty of Medicine, Assiut University, Assiut, Egypt
5. Department of Chest Diseases, Faculty of Medicine, Aswan University, Aswan, Egypt