"This is the peer reviewed version of the following article: Ibbotson,
S. (2018). Optimizing photodynamic therapy regimens: variables in
irradiation may influence outcomes. The British journal of
dermatology, 178(5), 1003. DOI: 10.1111/bjd.16470, which has been
published in final form at https://onlinelibrary.wiley.com/doi/
abs/10.1111/bjd.16470. This article may be used for noncommercial
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