1. Department of Pulmonary, Allergy, and Critical Care Medicine (G.K., R.A.D., A.R.T.), Respiratory Institute
2. Department of Pulmonary and Critical Care Medicine (M.K.A.), Respiratory Institute
3. Department of Chest Diseases, Faculty of Medicine, Assiut University, Egypt (M.K.A., G.M.A.).
4. Department of Internal Medicine (S.A.), Medicine Institute
5. Pathobiology Department (A.A.), Cleveland Clinic, OH.