Author Contributions: Dr Menzies had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Menzies, Nair, Williamson, Schembri, Barnes, Fardon, Lipworth.
Acquisition of data: Menzies, Schembri, Al-Khairalla, Barnes, Magee.
Analysis and interpretation of data: Menzies, McFarlane, Lipworth.
Drafting of the manuscript: Menzies, Lipworth.
Critical revision of the manuscript for important intellectual content: Menzies, Nair, Williamson, Schembri, Al-Khairalla, Barnes, Fardon, McFarlane, Magee, Lipworth.
Statistical analysis: Menzies.
Obtained funding: Lipworth.
Administrative, technical, or material support: Menzies, Nair, Schembri, Al-Khairalla, Barnes, Fardon, McFarlane, Magee, Lipworth.
Study supervision: Lipworth.
Financial Disclosures: None reported.
Funding/Support: This study was funded by the Asthma & Allergy Research Group, University of Dundee.
Role of the Sponsor: The University of Dundee had no influence over the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.
Acknowledgment: We thank Mark Eisner, MD, of the University of California for providing us with his version of the International Union Against Tuberculosis and Lung Disease questionnaire, without compensation.