Accepted for Publication: January 14, 2012.
Published Online: April 29, 2013. doi:10.1001/jamainternmed.2013.639
Author Contributions:Study concept and design: Linos, Parvataneni, and Chren. Acquisition of data: Stuart and Chren. Analysis and interpretation of data: Linos, Parvataneni, Boscardin, Landefeld, and Chren. Drafting of the manuscript: Linos. Critical revision of the manuscript for important intellectual content: All the authors. Statistical analysis: Linos, Parvataneni, and Boscardin. Obtained funding: Linos and Chren. Administrative, technical, and material support: Linos and Stuart. Study supervision: Linos.
Conflict of Interest Disclosures: Dr Chren is a consultant for Genentech, Inc.
Funding/Support: This study was supported in part by Award KL2RR024130 from the National Center for Research Resources (Dr Linos), by grants R01 AR 054983 and K24 AR052667 from the National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health (Dr Chren), and by a Career Development Award from the American Skin Association and Dermatology Foundation (Dr Linos).
Previous Presentation: This study was presented at the Sixth International Dermato-Epidemiology Association Congress; August 27, 2012; Malmo, Sweden.
This article was corrected for errors on December 6, 2013.