Fig. 1From: The Salford Lung Study protocol: a pragmatic, randomised phase III real-world effectiveness trial in chronic obstructive pulmonary diseaseStudy design. COPD = chronic obstructive pulmonary disease; DPI = dry-powder inhaler; FF = fluticasone furoate; GP = general practitioner; ICS = inhaled corticosteroid; LABA = long-acting β2-agonist; LAMA = long-acting muscarinic antagonist; Rx = treatment; VI = vilanterolBack to article page