#chronic_bronchitis  a form of bronchitis characterized by excess production of sputum leading to a chronic cough and obstruction of air flow
  supertype:  bronchitis  inflammation of the membranes lining the bronchial tubes
  subtype:  chronic_obstructive_pulmonary_disease__chronicobstructivepulmonarydisease  a nonreversible lung disease that is a combination of emphysema and chronic bronchitis; usually patients have been heavy cigarette smokers

No statement uses or specializes chronic_bronchitis; click here to add one.