Accepted for Publication: February 19, 2013.
Published Online: June 26, 2013. doi:10.1001/jamadermatol.2013.756.
Study concept and design: All authors.
Acquisition of data: All authors.
Analysis and interpretation of data: All authors. Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: Terra, Pas, Jonkman.
Statistical analysis: Bakker.
Administrative, technical, or material support: Bakker, Terra, Jonkman.
Study supervision: Terra, Pas, Jonkman.
Conflicts of Interest Disclosures: None reported.
Additional Contributions: Piet Toonder provided excellent photography and Janny Zuiderveen and Gonnie Meijer provided technical laboratory assistance.