Male and female subjects aged 20 years and over, with permanent or temporary residence for at least one year in the national territory;
Written informed consent for study participation.
You may not be if
Any condition that makes it impossible to perform spirometry, in accordance with standards of the joint American Thoracic Society/European Respiratory Society, and as described in the "Contraindications for spirometry testing" section of the Study Procedures Manual;
Any condition that makes it impossible to perform the bronchodilation, as described in the "Contraindications for bronchodilation" section of the Study Procedures Manual;
Severe cognitive disability that may interfere with the person's capability to participate in the study.
