As this is a non-interventional study, all treatment decisions will be made at the discretion of the treating physician prior to enrolment in the study and during the entire period of the study. Treatment will be prescribed according to the product label in the summary of product characteristics.

Change in Inhalation Technique Score, measured as percentage of correct steps on the Inhalation Checklist (itemized instructions of inhaler correct use per respective Summaries of Product Characteristics) at each routine follow-up visit up to 6 months versus baseline.

This is an hypothesis generating study. No formal primary endpoint is defined; parameters are evaluated in an exploratory or descriptive manner.

Degree of treatment adherence measured via the mean score on the Test of Adherence to Inhalers (TAI) questionnaire, including 5 questions completed by the patient (each item scored from 1 (worst) to 5 (best) with a range from 10 to 50) and 2 items completed by the physician (each item scored 1 (bad) or 2 (good) with a range from 2 to 4) at baseline and each routine follow-up visit up to 6 months versus baseline.

The number of moderate and severe exacerbations that occurred within the previous year is collected at the baseline visit and the number of moderate and severe exacerbations occurring during the study is collected at the final visit. Moderate exacerbations are defined as exacerbations that require oral corticosteroid and/or antibiotic treatment. Severe exacerbations are defined as exacerbations that require oral corticosteroid and/or antibiotic treatment plus hospital admission.