1. Department of Chest Diseases, Ain Shams University, Cairo, Egypt
2. Department of Internal Medicine and Clinical Haematology, Ain Shams University, Cairo, Egypt
3. Department of Clinical Pathology, EL-Abassia Chest Hospital, Ministry of Health and Population, Cairo, Egypt
4. Department of Chest Diseases, EL-Abassia Chest Hospital, Ministry of Health and Population, Cairo, Egypt