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    Ge Qian et al.. “Is the step‐up therapy of topical 5‐aminolevulinic acid photodynamic therapy effective and safe for the patients with recalcitrant facial flat wart?.” Dermatologic therapy, vol. 27, no. 2, 2014, pp. 83–88. http://access.bl.uk/ark:/81055/vdc_100024811533.0x000026