title: Difficulties in the diagnosis of asthma.
mesh_terms: D000402:Airway Obstruction / Q000145:classification; D001249:Asthma / Q000175:diagnosis*; D001991:Bronchitis / Q000175:diagnosis; D002245:Carbon Dioxide / Q000097:blood; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D010313:Partial Pressure; D011656:Pulmonary Emphysema / Q000175:diagnosis; D013147:Spirometry
chemical_list: D002245:Carbon Dioxide