Accepted for Publication: September 22, 2013.
Published Online: December 4, 2013. doi:10.1001/jamadermatol.2013.8417.
Study concept and design: Wang, Smith, Kang, Voorhees, Fisher.
Acquisition of data: Wang, Smith, Kang, Fisher.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Wang, Tran.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Wang.
Obtained funding: Kang, Voorhees, Fisher.
Administrative, technical, and material support: Wang, Smith, Kang, Voorhees.
Study supervision: Wang, Kang, Fisher.
Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by National Institutes of Health grants AR048077 (S.K.) and AG025186 (G.J.F.).
Role of the Sponsor: The National Institutes of Health 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: Heather Chubb, MS, provided statistical analyses, Laura VanGoor, BFA, assisted with graphical material, and Suzan Rehbine, LPN, assisted with UV lamp irradiation and tissue procurement. All are employees of the Department of Dermatology at the University of Michigan Medical School.