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APA Citation
Ling, T., Clayton, T., Crawley, J., Exton, L., Goulden, V., Ibbotson, S., McKenna, K., Mohd Mustapa, M., Rhodes, L., Sarkany, R., & Dawe, R. (2016). british Association of Dermatologists and British Photodermatology Group guidelines for the safe and effective use of psoralen–ultraviolet A therapy 2015. British journal of dermatology, 174, 24–55. http://access.bl.uk/ark:/81055/vdc_100028517391.0x000064