Accepted for Publication: November 22, 2013.
Published Online: July 2, 2014. doi:10.1001/jamadermatol.2013.9957.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Wu.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: All authors.
Administrative, technical, or material support: Qureshi.
Study supervision: Qureshi, Wu.
Conflict of Interest Disclosures: Dr Qureshi reported serving as a consultant for Abbott, Centocor, Novartis, and the Centers for Disease Control and Prevention. No other disclosures were reported.
Funding/Support: This study was supported in part by grant CA87969 from the National Institutes of Health.
Role of the Sponsor: The funding source 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.
Additional Contributions: We thank the participants and staff of the Nurses’ Health Study for their valuable contributions.