Inhaled corticosteroids for stable chronic obstructive pulmonary disease.
Cochrane Db Syst Rev. 2012 Jul 11; 2012 (7): CD002991CD002991.
Long-acting beta2-agonists for chronic obstructive pulmonary disease.
Cochrane Db Syst Rev. 2013 Oct 15; 2013 (10): CD010177CD010177.
Inhaled steroids and risk of pneumonia for chronic obstructive pulmonary disease.
Cochrane Db Syst Rev. 2014 Mar 10; 2014 (3): CD010115CD010115.