Accepted for Publication: January 22, 2013.
Published Online: May 1, 2013. doi:10.1001/jamadermatol.2013.511.
Study concept and design: Summers, Sontheimer.
Acquisition of data: Summers, Bingham, Dahle.
Analysis and interpretation of data: Summers, Bingham, Sweeney, Ying, Sontheimer.
Drafting of the manuscript: Summers, Bingham, Sontheimer.
Critical revision of the manuscript for important intellectual content: Summers, Bingham, Dahle, Sweeney, Ying, Sontheimer.
Statistical analysis: Sweeney, Ying.
Study supervision: Dahle, Sontheimer.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported in part by the Department of Dermatology, University of Utah School of Medicine. The statistical portion of this investigation was supported by the University of Utah Study Design and Biostatistics Center, with funding in part from the National Center for Research Resources and the National Center for Advancing Translational Sciences, National Institutes of Health, through grant 8UL1TR000105 (formerly UL1RR025764).
Role of the Sponsors: The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: We are indebted to Gerald Gleich, MD, and Harry Hill, MD, for sharing their thoughts concerning the design of this study.