Accepted for Publication: December 10, 2013.
Published Online: August 18, 2014. doi:10.1001/jamainternmed.2014.3867.
Study concept and design: Jonasdottir Bergman, Danielsson, Borg.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Jonasdottir Bergman, Borg.
Critical revision of the manuscript for important intellectual content: Khan, Danielsson, Borg.
Statistical analysis: Jonasdottir Bergman.
Administrative, technical, or material support: Jonasdottir Bergman, Khan, Danielsson.
Study supervision: Jonasdottir Bergman, Danielsson, Borg.
Conflict of Interest Disclosures: None reported.
Additional Contributions: Magnus Stenbeck, PhD, Maarten Sengers, MSc, and Johan Fastbom, PhD, proofread the manuscript and contributed to the discussion regarding the results, and Helena Schiöler, MSc, helped to extract data from the national registry of prescription drugs. All are colleagues at the National Board of Health and Welfare in Sweden. There was no financial compensation.