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Stritt, Andrea; Merk, Hans Friedrich; Braathen, Lasse Roger; von Felbert, Verena (2008). Photodynamic therapy in the treatment of actinic keratosis. Photochemistry and photobiology, 84(2), pp. 388-98. Malden, Mass.: Blackwell Publishing 10.1111/j.1751-1097.2007.00276.x