Ohar JA, Crater GD, Emmett A, Ferro TJ, Morris AN, Raphiou I, Sriram PS, Dransfield MT. Fluticasone propionate/salmeterol 250/50 µg versus salmeterol 50 µg after chronic obstructive pulmonary disease exacerbation. Respir Res. 2014 Sep 24; 15:105.