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Schnuch, Geier, Uter, & Frosch. (1998). Patch testing with preservatives, antimicrobials and industrial biocides. Results from a multicentre study. British Journal of Dermatology, 138(3), 467–476. doi:10.1046/j.1365-2133.1998.02126.x 
10.1046/j.1365-2133.1998.02126.x