. 2022 Jun 30;101(26):e29314. doi: 10.1097/MD.0000000000029314
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This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Schematic illustration of hollow and solid microneedles.