Author Contributions: Dr Ludvigsson 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: Ludvigsson, Montgomery, Ekbom, Brandt.
Acquisition of data: Ludvigsson.
Analysis and interpretation of data: Ludvigsson, Granath.
Drafting of the manuscript: Ludvigsson, Montgomery, Ekbom, Granath.
Critical revision of the manuscript for important intellectual content: Ludvigsson, Brandt.
Statistical analysis: Ludvigsson, Granath.
Obtained funding: Ludvigsson.
Administrative, technical, or material support: Ludvigsson.
Study supervision: Montgomery, Ekbom, Brandt, Granath.
Financial Disclosures: None reported.
Funding/Support: Dr Ludvigsson was supported by a grant from the Örebro University Hospital. This project was supported by a grant from the Swedish Society of Medicine, the Swedish Research Council, the Sven Jerring Foundation, the Örebro Society of Medicine, the Karolinska Institutet, the Clas Groschinsky Foundation, the Juhlin Foundation, the Majblomman Foundation, Uppsala-Örebro Regional Research Council, and the Swedish Celiac Society.
Role of the Sponsor: None of the funders had any role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.