Atopy and Frequency of Exacerbation in Chronic Obstructive Pulmonary Disease Patients

"Skin Prick Test (SPT): Common allergens including pollen, dust mites, Pet dander and mold.~Serum IgE Levels: Total IgE Peripheral blood eosinophil was defined as an eosinophil count ≥ 5%, Quality of Life Assessment: COPD Assessment Test (CAT)"