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Analysis of testing environment of microneedles in the scientific literature. (i) Different testing environments for each type of microneedle: a) dissolvable, b) coated, c) hollow, and d) solid. (ii) Different types of microneedles in each type of testing environment: a) in vivo, b) in vitro, c) in humans, and d) fabrication/characterization of microneedles.
