Accepted for Publication: October 28, 2014.
Published Online: February 11, 2015. doi:10.1001/jamadermatol.2014.4777.
Study concept and design: Chen, Fallah, Försti, Hemminki.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Chen.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Chen, Fallah, Kharazmi.
Obtained funding: Sundquist, Hemminki.
Administrative, technical, or material support: Försti, Sundquist, Hemminki.
Study supervision: Fallah, Försti, Sundquist, Hemminki.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported in part by German Cancer Aid (Deutsche Krebshilfe), the Swedish Research Council, the Swedish ALF project grants, and the Swedish Council for Working Life.
Role of the Funder/Sponsor: The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.