1. Chronic obstructive pulmonary disease among adults–United States, 2011;Centers for Disease C, Prevention;MMWR Morb. Mortal. Wkly. Rep.,2012
2. National Health Interview Survey (NHIS) Data;Centers for Disease Control and Prevention,2011
3. Chapter 4: disease statistics;US Department of Health & Human Services,2013
4. Inhaled corticosteroids for asthma therapy: patient compliance, devices, and inhalation technique;Cochrane;Chest,2000
5. Inhaler mishandling remains common in real life and is associated with reduced disease control;Melani;Respir. Med.,2011