Accepted for Publication: December 6, 2011.
Author Contributions: Dr Khumalo had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Khumalo. Acquisition of data: Beach, Wilkinson, and Khumalo. Analysis and interpretation of data: Beach, Wilkinson, Gumedze, and Khumalo. Drafting of the manuscript: Beach and Khumalo. Critical revision of the manuscript for important intellectual content: Wilkinson, Gumedze, and Khumalo. Statistical analysis: Gumedze. Obtained funding: Khumalo. Administrative, technical, and material support: Beach and Wilkinson. Study supervision: Khumalo.
Financial Disclosure: None reported.
Funding/Support: The original study was supported in part by the North American Hair Research Society (Dr Beach) and the Women's Dermatologic Society (Dr Beach). Dr Wilkinson is supported by the Medical Research Council (United Kingdom) and performed the laboratory work in facilities partially funded by Wellcome Trust grant 084323 and the Division of Dermatology, University of Cape Town. The cytokines for the current study were funded by a Galderma (South Africa) award for published work 2010 (Dr Khumalo).
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 Gail Todd, FCDerm, PhD, for enabling participant recruitment and scalp treatments and to Steven Glassman, MD, who supervised the Ottawa Health Research Institute ethics submission.