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Relationship of the number of technologies with keywords “skin” in the title and “promot* or enhanc* and penetrat* or absorp* or permeat* and nano*” in the abstract, found in the Espacenet (EPO) database between 2008 and 2018 according to the Clusters 1 (Cosmetic) and Cluster 2 (Pharmaceutical). (A higher resolution / colour version of this figure is available in the electronic copy of the article).
