Author Posting. © The Authors 2008. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in British Journal of Dermatology, 2008, 159 (2), pp. 505-506. http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2133.2008.08654.x/abstrac
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