Fernando J Martinez et al.
Lancet (London, England), 385(9971), 857-866 (2015-02-17)
Roflumilast reduces exacerbations in patients with severe chronic obstructive pulmonary disease. Its effect in patients using fixed combinations of inhaled corticosteroids and longacting β2 agonists is unknown. We postulated that roflumilast would reduce exacerbations in patients with severe chronic obstructive