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Distribution of patients with suboptimal peak inspiratory flow (PIFR) stratified by Global Initiative for Obstructive Lung Disease (GOLD) FEV1 severity stage, measured against R2 low–medium resistance inhaler (eg, Diskus® and Ellipta®; blue; suboptimal PIFR <60 L/min) and R5 high resistance inhaler (Handihaler®; orange; suboptimal PIFR <30 L/min).
