1. Department of Internal Medicine and Rheumatology, Faculty of Medicine, Umm Al Qura University, Mecca, Saudi Arabia
2. Pulmonary Disease Unit, King Abdulaziz Specialist Hospital, Taif, Saudi Arabia
3. Department of Chest Medicine, Faculty of Medicine, Mansoura University, Mansoura, Egypt
4. Department of Pulmonary Medicine, Al-Noor Specialist Hospital, Mecca, Saudi Arabia
5. Department of Hematology, Al-Noor Specialist Hospital, Mecca, Saudi Arabia